Toymods Car Club Inc: Tech & Conversions => Using POR 15 on new paint job ??

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lumpy
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Adelaide, SA
Registered:
May 2002

Re: Using POR 15 on new paint job ??

Thu, 07 July 2005 23:39

justcallmefrank wrote on Thu, 07 July 2005 20:10

Kravit wrote on Thu, 07 July 2005 18:22

ok, yeh i have about about 2 litres of it for my ae86, think should be enough ??

What this thing about painting it with brush and getting nice finish ? seems like get alot of brush strokes doing that.

So can you use it in normal spray gun ? any thinners anything can be added to it ?

Maybe, depending on how many coats you want. My car was stripped back to bare metal, had 3 coats on rust repairs, then two over whole car.

You can do the whole thing with a brush, but beware of dropping bristles, and you'll never get a brush clean enough to reuse, most of mine ended up like concrete. It will settle like it was sprayed, that is correct though.

I ended up spraying, I needed minimal thinners, and sometimes didn't use any at all. Thinners defeats the purpose of it not needing solvents to dry.

Is POR 15 a moisture cure urethane? It sounds like it. If so it's probably not great as a topcoat since they tend to yellow on aging/exposure to ultraviolet light (aromatic urethanes will yellow much more than aliphatic ones). This would also be why you need a special primer or to give it a sand before overcoating - moisture cure urethanes tend to get give a hard, tight, chemically resistant film which makes it difficult for other paints to "key" into them and get adhesion. They can be excellent for rusty metal primers though as they penetrate into rusted areas and are attrated to the moisture rich areas. It's also why the brushes are a bastard to clean - even if you think you have all the paint off a bit remains and dries in the bristles, turning the brush into a hammer.

No paints really need solvents to dry, solvents are used to adjust viscosity of the paint which in turn helps get correct spray pattern and film build. Faster evaporating solvents will flash off much quicker than slow solvent which gets less sag but increase the chance of "dry spraying" the paint. Solvents can certainly slow the rate of drying for paints that dry simply via evaporation (eg acrylic laquers).

Good quality synthetic brushes are > all IMHO.

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