[rx191]

what do you guys think of urethane primer, i'm working on a car for my brother inlaw and he wants to use urethane instead of epoxy. He said the local paint shop recommend the urethane because it's cheaper and would give the same results. It is a direct to metal primer and high build but i don't want to spray something that isn't going to work long term. Give me your thoughts please

[vicariouslynova]

Should be fine, acrylic primer is the cheap crap and should never be used.

Urethane is the best product in my opinion. I did have a buddy who got sold acrylic and told it was urethane, the differance is it must have a catalyzer.
FYI

[jcclark]

Epoxy is best for bare metal and is low build so it's usually not used
when only leveling is needed, that's what urethane is for, but urethanes
aren't as good for bare metal so most painters use both.
Epoxy for any bare metal or sealing and
urethanes for body work and light filling like scratches.
They are two different products for two different applications.
The "combo" ones I've tried, the urethanes rated for direct metal,
had a lot of shrinkage problems for me.
So I went back to useing both.
That's the best way.