Cladding & Surface Coatings

Can Interior Cladding Be Painted? A Complete Guide

Q: What coating system should be used on interior cladding?

Standard latex, oil-based, or general acrylic paints will not provide a durable finish on metal cladding, they lack the adhesion and flexibility required. For interior cladding, a specialist system is needed: a spray-applied bonding primer to seal the surface and inhibit corrosion, followed by a cladding-specific topcoat. Two-component acrylic systems provide excellent adhesion, flexibility, and colour retention. For surfaces with an existing PVF2 or Plastisol finish, a compatible tie-coat primer must be specified to ensure bond to the original substrate.

Q: How long does a painted interior cladding finish last?

A correctly specified and applied cladding coating system, bonding primer plus specialist topcoat, will typically provide 10–15 years of protective and decorative performance in an interior environment. Longevity depends on the quality of surface preparation, the coating system specified, and the humidity and temperature conditions within the building. Regular visual inspection to catch any damage early will help to maximise service life.

Q: Is cut edge corrosion on interior cladding repairable before painting?

Yes, cut edge corrosion at panel edges and fixings should be addressed as part of the preparation process before any topcoat is applied. A professional on-site spray contractor will treat corroded edges with a specialist cut-edge corrosion sealant or corrosion-inhibiting primer before applying the full coating system. Ignoring cut edge corrosion and painting over it will not prevent continued deterioration beneath the new coating.

Metal cladding is found on interior walls as well as building exteriors, particularly in warehouses, factories, cold stores, and industrial units. Yes, interior cladding can be painted, and when the correct preparation and coating system is used, the result is as durable as a factory-applied finish.

Anthony Jones, Vanda Coatings Updated February 2026 7 min read Cladding Surface Preparation Technical Guide

Interior metal cladding being recoated on a commercial industrial unit

Metal cladding is most commonly associated with building exteriors, the corrugated steel or aluminium panels that clad the walls of warehouses, industrial units, retail parks, and commercial buildings across the UK. What is less often discussed is that the same cladding materials appear on interior walls: cold-store linings, factory partition walls, internal loading bay walls, and plant room panels.

These interior surfaces are subject to the same deterioration as external cladding, moisture ingress, impact damage, and gradual breakdown of the original factory-applied coating, and the question of whether they can be painted on-site is a common one. The answer is yes, provided the preparation process is followed correctly and the right coating system is specified.

What is interior metal cladding made of?

The most common interior metal cladding consists of corrugated profiled steel panels, typically supplied from the manufacturer with a factory-applied protective coating. The two most prevalent factory finishes are:

Plastisol, a polyvinyl chloride (PVC)-based coating applied in a thick film. It offers good impact resistance and is widely used in agricultural, industrial, and commercial buildings.
PVDF / PVF2 (Polyvinylidene Fluoride), a fluoropolymer-based coating with superior UV resistance and colour retention. More common on architectural and higher-specification applications.

Both finishes are durable when maintained, but they degrade over time, particularly in environments with temperature fluctuations, condensation, impact from racking or machinery, or chemical exposure. When the original coating begins to fail, moisture can reach the metal substrate and corrosion begins.

Why does interior cladding need repainting?

In unheated storage facilities, the temperature inside can swing dramatically between seasons, in some cases approaching the same conditions as the exterior. Condensation on cold steel surfaces is a persistent problem in these environments, and even a small area of coating failure is enough to allow moisture to undercut and spread beneath the surrounding intact finish.

Beyond corrosion protection, interior cladding is often repainted for commercial and operational reasons:

A change of occupancy or business rebranding, the new tenant or owner wishes to apply their own corporate colour scheme
Aesthetic refresh, cladding that looked adequate when new appears grimy, faded, or dated after ten or fifteen years of industrial use
Hygiene compliance, food production, pharmaceutical, and healthcare facilities have specific finish and cleanability requirements that the original coating may no longer satisfy
Insurance or compliance requirements, certain insurers and building surveyors require evidence of maintained surface protection on metal structures

Key point: Recoating existing interior cladding is significantly cheaper than panel replacement. A professional on-site spray programme restores full protective and decorative performance without the disruption, structural implications, or cost of stripping and re-cladding.

10+

years' service life from a correctly applied specialist cladding topcoat

70%

typical cost saving versus full panel replacement on a comparable building

1–2

days to complete preparation and application on a typical interior bay

RAL

any RAL or British Standard colour available for interior cladding recoats

Why standard paints should not be used on interior cladding

This is the most important technical point in the entire process. Off-the-shelf emulsion, gloss, oil-based, and general-purpose acrylic paints are not suitable for metal cladding, whether interior or exterior.

The reasons are straightforward:

Adhesion failure, standard paints do not bond reliably to smooth or factory-coated metal surfaces. Without correct etching and priming, peeling is inevitable within months.
Insufficient flexibility, profiled cladding panels flex as the building moves and as metal expands and contracts with temperature change. Standard paint films are too rigid and will crack at the peaks and troughs of the profile.
Poor chemical and moisture resistance, interior environments in industrial buildings can involve cleaning chemicals, steam, oils, and humidity levels that standard decorative paints are not formulated to resist.
UV degradation (even indoors), skylights and roof glazing deliver significant UV exposure to interior cladding surfaces. Standard paints chalk and fade rapidly under UV exposure.

The correct solution is a specialist cladding coating system, bonding primer plus a purpose-formulated cladding topcoat, applied by airless spray for uniform coverage across the corrugated profile.

Factor	Professional spray application	DIY brush/roller application
Coverage on profiled panels	Uniform, spray penetrates corrugated peaks and troughs evenly	Uneven, brush misses troughs; roller cannot reach recesses
Coating system compatibility	Specialist cladding-specific system, correctly specified	Risk of using incompatible products, adhesion failure likely
Surface preparation	Full degreasing, keying, cut-edge treatment, priming	Typically inadequate, leads to premature failure
Speed	Fast, large areas completed in hours by spray	Very slow, corrugated profiles are extremely labour-intensive to paint by hand
Finish quality	Factory-quality, smooth, consistent	Brush marks and uneven film visible
Durability	10–15 years with correct system	2–4 years before visible failure

How to paint interior cladding: the full process

The following is the correct sequence for a professional interior cladding recoat. Each step is essential, skipping or shortcutting preparation steps is the primary reason recoat programmes fail prematurely.

Loose coating removal

Any flaking, bubbling, or delaminating coating must be removed before any other work begins. Wire brushing or scraping is suitable for localised areas; for large areas of severe coating failure, grit blasting or soda blasting may be required to take back to a clean metal surface. Leaving failed coating in place and painting over it will result in the new coating delaminating along with the old.

Cut-edge corrosion treatment

Cut edges, the exposed raw metal at panel ends and around fixings, are the most vulnerable areas of cladding panels. If corrosion is present at these points, it must be treated with a specialist cut-edge corrosion sealant before any topcoat work begins. Painting over active corrosion will not stop its progression; the sealant creates a barrier that prevents moisture ingress at these critical points.

Degreasing and cleaning

The entire surface must be thoroughly cleaned with a degreasing agent to remove oils, dust, mould, and any contamination that would prevent adhesion. Interior cladding in industrial environments often carries a film of airborne oil or process residue that is invisible to the eye but will cause adhesion failure if not removed. In heavily contaminated environments, a sterilisation wash may be required in addition to standard degreasing.

Rinse and dry

All cleaning products must be thoroughly rinsed from the surface. Any residual degreaser or cleaning chemical left on the panel will interfere with primer adhesion. Allow the surface to dry completely, applying primer to a damp surface is a common cause of early adhesion failure, particularly in the cool, humid conditions typical of unheated warehouses.

Keying the surface

The surface must be abraded to provide mechanical adhesion for the primer. On intact Plastisol or PVDF-coated panels, light sanding with an appropriate grade of abrasive paper or a scotch pad keys the surface without damaging the underlying substrate. The edges of any areas where coating has been removed should be feathered so that there is a smooth transition rather than a visible step at the boundary of old and new coating.

Dust removal and final wipe-down

Sanding generates fine dust that must be completely removed before priming. Brush down and vacuum thoroughly, then wipe the surface with a clean tack rag to capture any remaining fine particles. Any dust left on the surface will be trapped in the primer film, producing a textured finish and reducing adhesion.

Masking

All areas that are not to be coated, doors, windows, pipework, conduit, floor areas, machinery, and adjacent wall surfaces, must be masked before spraying begins. Interior environments have more obstacles and adjacencies than open external elevations, so thorough masking takes additional time but is essential to prevent overspray on surfaces that are not part of the scope of work.

Bonding primer application

A spray-applied bonding primer seals the surface, provides a uniform base for the topcoat, and inhibits any residual corrosion. The primer must be compatible with both the original coating system and the topcoat to be applied, primer selection is a technical decision that depends on what the existing coating is. Allow the primer to cure fully to the manufacturer's minimum overcoating time before applying the topcoat.

Topcoat selection

The topcoat must be a specialist cladding coating, not a general-purpose paint. For interior cladding with an existing Plastisol or PVDF finish, a compatible 2K acrylic or specialist cladding topcoat is the appropriate specification. The coating is available in any RAL or British Standard colour, allowing colour-change programmes to be completed in a single visit without panel replacement.

Topcoat application and inter-coat preparation

The topcoat is applied by airless spray in two or more coats to achieve the specified dry film thickness. The corrugated profile of cladding panels makes uniform coverage critical, spray angle and gun distance must be adjusted to ensure adequate coverage in the troughs as well as on the face of each profile rib. Where multiple coats are required, light abrasion between coats improves inter-coat adhesion and ensures a smooth, even final surface.

Signs that interior cladding needs recoating

Interior cladding deteriorates more gradually than external cladding because it is sheltered from direct rain and UV. However, several indicators suggest that recoating should be scheduled before the situation deteriorates further:

Chalking, a powdery residue on the surface when you run a finger across the panel indicates UV degradation of the coating binder
Fading or colour change, significant colour shift from the original finish suggests the topcoat is breaking down
Blistering or bubbling, raised areas in the coating indicate moisture has penetrated beneath the film; these areas will progress to full delamination and corrosion if left
Rust staining or streaking, orange-brown staining running down panel faces or appearing at fixings indicates corrosion has begun at cut edges or areas of coating failure
Delaminating or peeling edges, coating lifting away from panel edges is a classic sign of cut-edge corrosion and will spread if not addressed
General dirtiness that cleaning cannot shift, a deeply chalked or degraded surface absorbs contamination; cleaning restores the surface temporarily but the coating integrity is already compromised

Benefits of recoating

Fraction of the cost of panel replacement, typically 20–30% of replacement cost
Work can be carried out in occupied buildings during off-hours with minimal disruption
Any RAL or BS colour, full rebrand or colour change possible
Restores full corrosion protection, cut-edge treatment included as part of the programme
No structural work required, no scaffolding removal, no panel replacement, no insulation disturbance
10–15 year service life from a correctly applied specialist coating system

Limitations to be aware of

Panels that are structurally damaged or severely corroded cannot be restored by painting alone, replacement is required
Preparation is essential, shortcuts lead to early failure and cost more in the long run
Not all coating types are compatible, primer selection must match the existing substrate coating
Adequate ventilation is required during spray application in enclosed spaces

At Vanda Coatings, we carry out interior cladding recoat programmes in occupied warehouses, factories, distribution centres, and commercial buildings across the UK, working around operational schedules to keep disruption to a minimum. Every project begins with a thorough condition survey to identify the exact coating system on the existing panels, assess the extent of any corrosion, and specify the correct primer and topcoat for the substrate and environment.

Frequently asked questions

Q Can interior metal cladding be painted?

Yes, interior metal cladding can be painted successfully provided the surface is correctly prepared and the right specialist coating system is used. This means removing any flaking coating, degreasing thoroughly, keying the surface, applying a bonding primer, and finishing with a cladding-specific topcoat. Standard emulsion or general-purpose paints are not suitable, they will not adhere properly and will fail within months.

Q Why does interior cladding need painting?

Interior cladding, particularly in unheated industrial spaces, is exposed to temperature fluctuations, condensation, and moisture. Over time the original factory-applied coating degrades, allowing moisture to reach the metal substrate and cause corrosion. Repainting restores the protective barrier and dramatically extends cladding service life. It is also commonly required following a change of occupancy, a rebranding exercise, or where hygiene standards require a fresh, cleanable surface.

Q What coating system should be used on interior cladding?

A specialist cladding coating system is required, not standard decorative paint. For interior cladding with an existing Plastisol or PVDF factory finish, the correct specification is a compatible bonding primer followed by a purpose-formulated 2K acrylic or cladding-specific topcoat. The primer must be selected to ensure compatibility with the original substrate coating, using an incompatible primer is one of the most common causes of premature adhesion failure.

Q Can you paint interior cladding without shutting down operations?

Yes, professional on-site spraying of interior cladding can be completed while the building remains in use, provided spraying is scheduled during off-peak hours and adequate ventilation and masking are in place. Vanda Coatings regularly carries out interior cladding programmes in occupied warehouses, factories, and commercial units with minimal disruption to operations.

Q How long does a painted interior cladding finish last?

A correctly applied specialist cladding coating system, bonding primer plus appropriate topcoat, will typically provide 10–15 years of protective and decorative performance in an interior environment. Longevity depends on the quality of surface preparation, the coating system used, and environmental conditions within the building. Regular visual inspection to identify and address any damage early helps to maximise service life.

Q Is cut-edge corrosion on interior cladding repairable before painting?

Yes, cut-edge corrosion at panel edges and fixings should be treated as part of the preparation process before any topcoat is applied. A professional on-site contractor will treat corroded edges with a specialist cut-edge corrosion sealant or corrosion-inhibiting primer. Painting over active corrosion without treatment will not stop its progression, the rust will continue to spread beneath the new coating and cause early failure.

Anthony Jones

Director, Vanda Coatings, 29 years experience

Anthony has been specifying and supervising cladding recoat programmes on commercial and industrial buildings across the UK since the late 1990s. Interior cladding restoration, particularly in warehouses, factories, and cold-storage facilities, is a regular part of Vanda Coatings' project workload, and getting the preparation and coating specification right from the outset is the only way to guarantee a result that lasts.