Protect a camper or caravan underside and exposed metal

Guide to protecting a camper or caravan underside

A camper or caravan underside needs a clean, dry and stable surface before rust treatment, epoxy primer, wax, bitumen coating or textured 2K protection is applied. This guide focuses on lower panels, exposed steel, wheel arch areas and chassis sections that face road dirt, moisture, salt and stone impact.

What do you need to protect a camper or caravan underside?

Cleaning and degreasing

Mipa silicone remover in liquid or spray format removes grease, wax, oil and silicone before sanding, rust treatment, primer or protective coating.

Sanding and surface preparation

The MP Fine sanding pad helps abrade stable old coating, smooth repaired edges and prepare local underside areas before the next coating stage.

Rust treatment

Miparox anti-rust spray and Mipa Rust Sealant support prepared local corrosion zones after loose rust and weak coating have been removed.

Epoxy primer filler

Mipa EP primer filler with EP Hardener E 25 normal and EP Thinner gives prepared metal an epoxy base with corrosion protection before final underside protection.

Bitumen underside protection

Mipa Underbody Protection Spray and Mipa underbody protection 1l create black bitumen based protection for wheel housings, sills and floor pan areas.

Wax and textured protection

Mipa Underbody Protection Wax gives a wax based barrier, while Mipa Protector black and Mipa Protector 2K Spray give a tougher structured 2K protective coating.

How to protect a camper or caravan underside

1
Clean and dry the underside

Wash away road dirt, let the underside dry fully, then degrease coating zones with Mipa silicone remover.
2
Remove weak material

Abrade loose coating, sharp edges and unstable rust so the coating build starts on a sound surface.
3
Treat local corrosion

Use Miparox anti-rust spray or Mipa Rust Sealant only on prepared rust affected metal that is suitable for treatment.
4
Prime exposed repair areas

Apply the EP primer filler system to bare or repaired metal areas that need an epoxy protective foundation.
5
Apply underside protection

Finish with bitumen coating, wax or textured 2K protection according to the area size, exposure and desired surface structure.

Which underside protection should you choose?

Aerosol local repair

Choose Mipa Underbody Protection Spray for smaller wheel arch, sill and local underside repairs where aerosol control is practical.

Brushable larger area coating

Choose Mipa underbody protection 1l for accessible underside sections where a brushable black bitumen coating fits the work area.

Higher wear textured protection

Choose Mipa Protector black or Mipa Protector 2K Spray for exposed areas that need a more structured and mechanically resistant protective finish.

Technical details

Mipa EP primer filler is a 2K epoxy primer filler with strong corrosion protection and adhesion on prepared steel, aluminium, zinc and GRP surfaces.
Mipa Protector 2K Spray is a 2K polyurethane acrylic protective coating for heavy duty surfaces such as underbodies, chassis, caravan floors and storage areas.
Bitumen underbody protection and wax protection serve different protective roles, so use them by area and exposure rather than as one mixed wet layer.
Keep brakes, exhaust parts, sensors, drain openings, rubber mounts and moving components free from protective coating.

Practical suggestion

Work in small sections so cleaning, drying, rust treatment and coating stay controlled. On older campers and caravans, inspect seams, fixing points and stone impact zones before choosing between wax, bitumen protection and textured 2K protection.