Pinholes

They driving me nuts

I was thinking of spraying thinned epoxy as a hot coat , but I guess this isn’t going to cover pin holes … But would leave a similar finish to a 2k clearcoat

What other options than brushing epoxy on ?

Pinholes can be a real pain. One of my products is constantly plagued by them out of the mold and I have yet to solve the problem during layup/cure.

Even more of a pain is that most of the finishes (hot coat of epoxy, or clearcoat) don’t fill them but often leave fisheyes on the surface. That’s an even bigger pain.

I hate to admit defeat, but the way I deal with them is to mix up some paste body filler (tinted jet black) and work it over the surface to fill the pinholes. Once it cures, wipe off or lightly sand the surface and proceed with clearcoating.

It does the trick, but it’s still brings me shame.

Duratec Sunshield is your friend.

brush on 2k clear with foam brush,cure,sand :frowning:

ive found the best thing for pin holes !!!

get someone else to fix em :smiley:

the local panel shop is doing my clear coat and it looks great !! just waiting for a price now eeek :S

For filling pinholes I like brushing the Duratec and then also spray directly over it too.

Generally it’s hard to fill pinholes with a spray application but brushing works well to push resin into the pinholes. The second spray coat just levels to all out a bit nicer and leaves something to sand back into.

Brushing epoxy will fill your pin holes but it will also likey run everywhere and is also really hard to sand compared to Duratec or two pack paint.

are you guys doing that with duratec sunshield topcoat and then spraying to be exact?

With the Duratec Sunshield, I spray the initial mist coats as per normal. Then when spraying the wet coat, use a brush to force the coating into the porosity. Keep spraying and brushing until all the pinholes are filled, then spray one final wet coat to make things level a bit.

With a bit of practice, you can pull this off so well that you only need to do 20 minutes of sanding to get it perfect. I don’t worry about pinholes on cosmetic parts any more because they are so easily fixed.

I spray all of my items with a automotive clear and if there are any pin holes, I use a toothpick dipped in the clear to fill them. Then a final coat or two, or 3, and they pretty much disappear. My parts are small though, so this is really quick for me. :slight_smile:

Exactly.

Spray gun in one hand and brush in the other. Duratec with 10% MEK thinners. Apply a spray coat and immediately brush over it while wet and before it gets tacky which forces the resin into the pin holes. Then carry on with another coat or two of spray only coats.

ive finally given in and bought a gallon of duratec sunshield … hope its works well