I sprayed the car in epoxy primer this weekend...but now find myself rather confused because I read different things. My goal here is to get this thing back on the ground...exterior paint will come later. What I have is some single stage acrylic enamel I plan to pain the undercarriage, the interior and the engine bay with(exterior will be a basecoat/clearcoat acrylic urethane, but that is sometime next year). My goal here is to get this enamel down in the next month or so, which will allow me to get the car back on the ground and start re-assembly. I have a couple areas that will need some minor body filler to smooth things out here and there, and that will be my first order of business, but after that I have heard two different approaches:
1. Sand, recoat with epoxy primer again, sand, and spray with paint.
2. Sand, lay down some 2k primer, sand, and spray with paint.
Using 2k I am sure is needed for the exterior of the car...but I am a lot less picky about the undercarriage and the interior since they will essentially never be seen(aside from dash panel and a-pillars which will get a different paint setup anyway). The enamel is essentially there to provide an easy to wash surface while still being visually pleasing on a quick glance. Any suggestions are appreciated.
Scratch it with some 3M red pads and spray the paint color you want as long as it is compatible with your epoxy primer.
It you are going to block out the underside of the car, your crazy if you are going to do that for anything short of riddler, then high build in three or four coats let it dry and shrink and block out. Then one last coat, sand to 360/600 your choice and then spray paint.
NOHOME
MegaDork
9/9/20 12:33 p.m.
Scuff the epoxy with a pad and topcoat it. It is called epoxy PRIMER for a reason.
I think that you could have shot the color on top without having to scuff had you done it withing 24 hours. Once again, the technical data sheet tends to have a wealth of information about stuff like this.
I'm a big fan of box liner for the underside of stuff. Follow the instructions on the can.
Epoxy primer is not intended to be "sandable." It's used as a durable sealer that is then to be coated with a compatible "sandable primer" to get the surface ready for the topcoat.
Your option #2 would seem correct for the exterior. Check the data sheet for compatible topcoats. If you're using DP90-LF, that info is here:
https://repaintsupply.com/files/DPLF-TDS.pdf
In reply to NOHOME :
The tech sheets aren't exactly clear....the enamel I am using is compatible with the primer I sprayed, no question there, but the steps are:
1. Abrade with 150 grit then 320 grit sandpaper or equivalent.
2. Wipe with KW901 Grease and Wax Remover or KW902 Anti-Static Panel Kleaner
3. For best results apply anti-corrosive primer such as KEP Series epoxy primers
This implies that the sanding steps apply to existing finishes...but it could mean that after the sanding steps I should re-apply a new coating of KEP and spray the enamel shortly afterwards. I know these are newb questions, but it is my first paint job. Also, the car was sandblasted...leaving an initial finish of about 80 grit on a guess, so I did not think it was a great idea to spray the enamel directly over the primer without sanding first....I could be wrong, but it seems if I did that the enamel finish would come out much too rough.
