Body fiiller after epoxy primer

  • Thread starter Joe's Notchback
  • Start date
J

Joe's Notchback

I have already sprayed epoxy primer on a fender that needs just little filler to smooth a couple small dent already hammered and dolly before primer. It will be close to 48 hours since primed.
Can I still add filler without recoating primer or do I scuff?

Joe
 
You can fill it without sanding, supposedly up to a week, I find that after 72 hours a red pad scuff helps short term adhesion.

If in doubt, give it a good rub with a red pad and blow it off before filling.
 
Either way at this point is fine, the bodyfiller will stick like glue to unsanded epoxy for 7 days.
 
What grit should you use after the 7 day window if you need to do filler work?
 
RAC65;732 said:
What grit should you use after the 7 day window if you need to do filler work?
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I'll give this a bump since this wasn't answered and I like to know too.
 
Kinda depends on how far out of the window, if the primer has been exposed to elements, ambient temps, etc. If it's been more than a month, generally we will sand the entire thing with 150 and red scotchbrite, and re-prime. Less than that, and if the panel(s) have been inside, we will 150 it and scratch the inaccessible areas with scotchbrite before filling. It will be obvious by looking at the featheredges if there is an adhesion problem.
 
I've never seen any adhesion problems applying ployester fillers and primers over cured epoxy if it was scuffed with 180, recoating within the recoat window is the best though. An overnight cure on two coats of epoxy is optimum in my opinion-polyproducts and SPI epoxy just welds together like they were made for each other.

Roger, I know you're a Slick Sand fan right? Here's an option for you: shoot the epoxy over the complete panel, allow to cure overnight, then apply two coats of slicksand, block. Any low areas can be filled over the slicksand the same as applying multiple coats of filler-and this way you have captured the benifit of the epoxy's recoat window. Or you might be doing your work in mostly epoxy now? Bob
 
Bob Hollinshead;997 said:
Roger, I know you're a Slick Sand fan right? Here's an option for you: shoot the epoxy over the complete panel, allow to cure overnight, then apply two coats of slicksand, block. Any low areas can be filled over the slicksand the same as applying multiple coats of filler-and this way you have captured the benifit of the epoxy's recoat window. Or you might be doing your work in mostly epoxy now? Bob
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Bob, Yes, I do like Slick Sand. I've had real good luck with it in the past. On my '55 Bel Air project I'm working on now, so far I've only painted the firewall and dash. I used epoxy, did a little sanding and blocking (used a little metal glaze spot putty too), resprayed epoxy and then sprayed the base&clear. I think I will do exactly what you say when I get to the rest of the car. But, I only will use the Slick Sand on the areas where I've worked the metal. I will also start out with black epoxy, spray the Slick Sand and block. Then I will follow up with additional epoxy coats in gray.
Btw, I bought that Vaper 2.3 gun that Shine likes for epoxy. I haven't used it yet since so far I've only done small areas of the car. But, I'll use it when I get to the rest of the car and I'll use it for the Slick Sand too. In the past, I used an HF 2.3 siphon feed gun for Slick Sand.
 
Roger, how are you liking the SPI epoxy primer-awesome stuff isn't it? You'll like the gravity feed for the polyester, add some acetone or spi reducer if you need it to lay down better-also extends the potlife a little. The SPI turbo primer also works well if you're looking for less build-sands nice.
 
Roger, how are you liking the SPI epoxy primer-excellent product isn't it? You'll like the GF gun for spraying poly, add some acetone or SPI reducer if you need it to go on thinner/flatter and it also extends the potlife some. SPI's turbo primer also is good if you don't need as much build.
 
Bob Hollinshead;1042 said:
Roger, how are you liking the SPI epoxy primer-awesome stuff isn't it? You'll like the gravity feed for the polyester, add some acetone or spi reducer if you need it to lay down better-also extends the potlife a little. The SPI turbo primer also works well if you're looking for less build-sands nice.
Click to expand...

Oh yeah, it sure is. Actually, I've been using it for a few years now. But this '55 is the first project where I'm using in almost exclusively. I used it on the frame and suspension parts too. The epoxy builds well and sands great and the sheen makes it so you don't need a guide coat. I really don't see the need for any other primer for me except for the occasional times you want an extremely high build poly primer for metal worked areas.
 
What brand filler do you guys recommend for going over your epoxy primer with? I have heard good things about Evercoat Rage Gold.

Thanks!
 
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