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Do I need to epoxy fiberglass?

17K views 34 replies 13 participants last post by  deadbodyman 
#1 ·
I have some body parts that are fiberglass and I am going to BC/CC them to match the car. Should I shoot epoxy on the properly sanded/prepped parts?
Thanks
Ron
 
#28 ·
Do a comparison yourself. If I remember right, Featherfill is a pretty well respected filled polyester primer. Evercoat makes some good stuff.

I have to spray filled primer maybe 2 or 3 times a year, and I'm not going to spend time doing a test when the Duratec already does everything I ever wanted it to.

If I remember correctly though, when we used featherfill in the glass shop it didn't fill all that good, and wouldn't take a polish vet well ...which makes me believe it's more porous...

( I know, why would anyone polish primer? It's a common practice to polish a plug prior to taking a mold from it...If you can build a plug and prime it with a filled primer, then sand it and polish it without putting a coat of high gloss paint, it saves many hours in the tooling shop)

Later, mikey
 
#29 ·
your right it is a little pourus,never did try buffing it.so the dura tec doesn't shrink so much ..... right? sounds like something worth trying I got a perfect car to try it on.....it must dry rock hard to be used in molds. I gave up on featherfill years ago when I forgot to add the mek hardner and primed a whole car....yeah thats pretty dumb but I did it twice
 
#30 ·
This is probably a good time to post this as DBM just reminded me of when mistakes happen when you forget to add hardener or something else happens with 2K products. Have plenty of paper towels on hand and either Klix or Prep-Sol. You can then wash off your mistake and not damage the primer or anything beneath it. You may have to remask your work but you won’t have to redo your work to finish. Yes, I’ve made some pretty stupid mistakes too.
 
#31 ·
deadbodyman said:
so the dura tec doesn't shrink so much ..... right? sounds like something worth trying I got a perfect car to try it on.....

The duratec is very stable.

I am recommending Duratec for application over fiberglass substrates. If you want to shoot this over steel, there are a couple of extra steps you need to do to the substrate.

I'm not familiar with them, my experience is with fiberglass parts. This thread is about priming fiberglass parts.

As for the problems you might have with forgetting to add catalyst...well ...you will only do that once, and that is your problem, not the primer's problem. :rolleyes:

Later, mikey
 
#32 ·
that works great for paint CJ but this stuff can go on 1/4" thick if you want it too (I call it spray bondo) I actually had to scrape it off with a putty knife first,also I prayed for three days for it to get hard and it kinda did but you could dig it out...what a mess but those days lauquer primer was the industry standerd,hardner was new to us
 
#33 ·
True. I was lucky to never forget the hardener. I will have to admit that todays products have improved quite a bit. In the old days if you used anything with reducer you were pretty much screwed in reworking anything. This 64 chevy I'm doing I used reducer in the 2K primer till I ran out of reducer then tried a mix with some thinner and got no lift like I would back in the days. Got so confident with it we bought some single stage PPG enamel with hardener and I reduced it with Dupont 3661S thinner with no problems, Just like I used to in the old days. Only painted the hood,bed and tailgate so far. Plan on painting the rest tomorrow.
 
#34 ·
Ok so basically doing metal work you strip, spray with epoxy, do filler work, spray with 2K urethane primer, block and then epoxy prime as sealer and paint. Doing fiberglass you'd just have to spray either featherfill or dura tech, block, prime with epoxy as sealer, and paint?
 
#35 · (Edited)
Use epoxy on fiberglass first ,just like bare metal,but "Shine" is the local fiberglass expert,I'd talk to him before I started stripping a vette...but as for metal thats the basic idea ,yes...strip,epoxy,bodywork,epoxy again,.....sandwich your bodywork....after that theres many options and proceedures...the choice is yours....theres advantage's and disadvantages to each...once its epoxied and bodywork is done find out about each proceedure and pick the one that best suits you.It gets complicated so take your time, do your homework......but forget about feather fill its hard sanding and theres much better and cheaper products out there...powerrodsmike,has some great primer he uses on big molds,he swears by it so it must be good,ask him about it if your interested
 
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