Ulysses

I thought you could put raptor on bare metal? Or am I thinking of linex?

Nope, raptor works best onto an original paint finish, if bare metal then its gotta be the acid etch primer stuff then raptor. Ive not tried linex/gravitex stuff, but it might be a better option for underside stuff

#Red-oxide and #Hammerite ! :lol:

I used Gravitex on the underside of my jimny body.  It's made by U-Pol, same people that make raptor.  The gravitex has a textured orange-peel finish.  I've not used raptor, but apparently it has a smooth appearance.

I just used QD primer on the bare metal  (as I had that laying around) and then chucked two coats of gravitex on.  I don't know if that's the right way to do it, but it's on now .  I should have probably splashed out on some epoxy primer and then sprayed on the gravitex.  I've only ever used etch primers when painting aluminium,I couldnt tell you if you get etch primers for steel, maybe U-Pol recommend that in their raptor coating sytem?  When I've primed steel with single pack paints, it's usually an alkaline phosphate or zinc phosphate primer.  However, Vinyguard Silvergrey 88 would be good for single pack applications as it's used for priming topsides and bottomsides of boats.  So many different applications, but as long as you use a correct system of paints, primer, midcoat and topcoat, you can't go wrong.

I think Terry used etch primer after fetching off any of the original underseal that wasn't sound, then Raptor and waxed the cavities....

 
 
 

Good luck with your toils Riccy, Look forward to seeing you in Wales....

sniper

Regarding corrosion protection, as already mentioned above, it is very important that a suitable system is used. Generally this is
- removing of rust
- stabilizing
- grounding that the protective layer sticks to the metal
- protective layer(s)

A pretty good German website (and shop) would be www.korrosionsschutz-depot.de/ but also many paint manufacturers give instructions and a good paint seller might also be able to help you.

In industrial applications, in my opinion, the coating type C4M would be the best fitting. This coating type, if applied properly, should be sufficient for 20 years.