Paint hot dip galvanized or zinc coated parts

Guided galvanized metal coating

Guide to painting hot dip galvanized or zinc coated parts

Hot dip galvanized and zinc-coated parts can reject paint when the surface is smooth, oily or weathered unevenly. Cleaning, very fine keying and the right primer or 2K PU finish help the coating grip without hiding the reason the zinc layer is there.

What do you need to paint hot dip galvanized or zinc coated parts?

Cleaning and degreasing

Mipa silicone remover in liquid or spray format removes wax, grease and silicone so sanding, primer and topcoat work starts from a clean metal surface.

Very fine surface keying

MP Non-woven Sanding Pad Very Fine red lightly keys zinc-coated surfaces, corners and detailed parts so the next coating has a cleaner grip.

Epoxy primer system

Mipa EP 100-20 with Mipa EP 950-25 hardener and Mipa EP Thinner creates a zinc phosphate epoxy primer layer for steel, aluminium, zinc-coated metal and other demanding substrates.

Brush and roller semi-gloss PU finish

Mipa PU 250-50 with Mipa PUR Plus Hardener A60 net and Mipa 2K Thinner Normal V25 gives a long-open 2K PU finish for doors, facades, machines and steel constructions.

2K spray finish for detail work

Mipa Mix PU 250 2K Paint Spray 48+ 400 ml helps finish smaller edges, hinge zones, narrow profiles and touch-up areas in the same job context as the PU 250 coating.

How to paint hot dip galvanized or zinc coated parts

1
Clean the zinc surface

Remove grease, salts, white oxidation and handling marks before abrasion starts.
2
Key carefully

Use a very fine non-woven pad to dull the surface without cutting unnecessarily through the zinc layer.
3
Clean again

Remove sanding residue and wipe the part clean before primer or topcoat is applied.
4
Prime where needed

Use the EP primer system on prepared areas that need a corrosion-resistant base or where the coating build requires primer.
5
Apply the finish

Apply the PU 250 semi-gloss finish or use the PU 250 2K spray for smaller parts and local repairs.

Which galvanized metal coating products should you choose?

For larger zinc-coated parts

Choose the PU 250 liquid system when doors, brackets, panels or exterior details need a brushed or rolled semi-gloss finish.

For small zinc-coated items

Choose the PU 250 2K spray for fittings, narrow edges and smaller parts where a compact 2K application is cleaner.

For demanding adhesion areas

Choose cleaning, fine keying and the EP primer system when the zinc surface is weathered, repaired or exposed to tougher service.

Technical details

Mipa PU 250-50 is suitable for steel, aluminium and zinc-coated surfaces and is particularly suited to brush or roller application.
The PU 250-50 system uses Mipa PUR Plus Hardener A60 and Mipa 2K Thinner for the matched 2K coating setup.
Mipa EP 100-20 is an epoxy zinc phosphate primer that can be used on zinc-coated steel after proper preparation.
Smooth zinc surfaces need contamination removal and controlled keying because poor preparation can lead to peeling.
Very fine non-woven abrasion is useful where the zinc layer should be keyed without aggressive scratch marks.

Practical suggestion

Treat zinc-coated parts as adhesion-sensitive. A small test area on a hidden face is a sensible check before coating all visible surfaces.