Coat metal exposed to chemicals

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Guide to coating metal exposed to chemicals

Metal exposed to chemicals needs a carefully prepared epoxy system with primer, compatible hardener and a topcoat selected for chemical and mechanical strain.

What do you need to coat metal exposed to chemicals?

Cleaning and degreasing

Mipa silicone remover in liquid or spray format removes grease, wax and silicone before sanding, priming or coating.

Epoxy corrosion primer

Mipa EP 100-20 gives a zinc phosphate epoxy base on steel, zinc, aluminium, GRP and mineral surfaces; use it with Mipa EP hardener and EP thinner.

Chemical resistant epoxy topcoat

Mipa EP 200-90 forms a gloss 2K epoxy topcoat for steel, zinc, aluminium, GRP and mineral surfaces exposed to mechanical or chemical strain.

How to coat metal exposed to chemicals

  1. 1
    Identify the exposure

    Check whether the part sees occasional splashes, regular cleaning chemicals or standing liquid before choosing the coating area and film build.

  2. 2
    Clean and abrade the metal

    Remove oil, residue, loose paint and corrosion, then create a keyed surface for epoxy primer.

  3. 3
    Prime with epoxy

    Apply Mipa EP 100-20 with the matching EP hardener and EP thinner on properly prepared metal.

  4. 4
    Apply epoxy topcoat

    Finish with Mipa EP 200-90 using Mipa EP 950 hardener and EP thinner so the primer and topcoat remain in one epoxy system.

  5. 5
    Allow full curing

    Keep the coated part away from chemical exposure until the coating has cured according to the technical information.

Which epoxy coating products should you choose?

Primer plus epoxy topcoat

Use EP 100-20 and EP 200-90 where the metal needs a dedicated chemical protection paint build.

Cleaner format

Use liquid silicone remover for larger surfaces and silicone remover spray for smaller metal items, seams and corners.

Technical details

  • EP 200-90 is a 2K epoxy topcoat for steel, zinc, aluminium, GRP and mineral surfaces and is listed by Mipa for chemical protection paint and floor coating use.
  • EP 100-20 is suitable as primer under chemical protective coatings.
  • Both primer and topcoat use epoxy system components, so Mipa EP hardener and Mipa EP thinner remain important companion products.
  • Chemical resistance depends on the exact chemical, concentration, contact time, film build and full cure, so critical service should be checked against technical advice.
Practical suggestion

Make a small test area on a cleaned and keyed offcut or hidden section when the exposure is unusual. It is better to confirm adhesion and resistance before coating the whole part.

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