Spi epoxy, then poly. What’s your opinion?

This thread is the closest I've found for my question so I'll tag onto it.
Working on doors and hood of my project. The process steps i've taken is as follows.
Weld and hammer as necessary, epoxy, body filler then Turbo High Build Primer then block.
I'm finding that I need just a little more fill to get some spots flat. I'm out of Turbo High Build but I have some slicksand on hand.
Can I apply the slicksand over the High Build for final blocking?
Thanks
 
Yes but not a perfect situation, stability wise.
It's been done, but I would get some icing or dolphin glaze.
 
In the future it would be better to keep using epoxy instead of urethane primer until you are very sure that no more polyester products (filler, putty, poly primer) are needed. SPI epoxy is designed to have polyesters put on top on it, but urethanes really aren't. Also the epoxy has some filling power and can be blocked.

I would make sure that the urethane primer is VERY cured before putting any polyester on top of it.
 
In the scenario that is asked would putting a coat of epoxy down on the turbo as a sealer/adhesion coat help in any way? In my rookie mind it would seem like it would but I don't actually know if it would make a difference.
 
Barry, I've been using USC Icing glazing but I have a hard time sanding it it without over sanding the surrounding area.
I failed to mention that I also have some Nason 2K primer. I know that you're not a fan of Nason but how about using it in multiple coats to fill the low spots?
Sprint_9. I was wondering that same thing.
 
As Crash said, it's better to have all your polyester products over epoxy, also, I put a coat of epoxy (or 2) over the filler work then block with 180 just enough to check for low spots or pinholes before I spray the 2K or poly. That being said, if you have any more epoxy, you could spray 1 coat, wait 48 hrs., then spray your poly.
 
Thanks, texasking. I'm going with the nason regular build 2 k. It should have similar sanding characteristics to the turbo 2k, --- I hope.
 
grogetter said:
Thanks, texasking. I'm going with the nason regular build 2 k. It should have similar sanding characteristics to the turbo 2k, --- I hope.
Click to expand...

Is not a bad primer to sand, but I don’t think it can match the Turbo’s ease of sanding. I was just using them side by side yesterday on a complete. Both sand way better than OMNI Shopline stuff.
 
Sprayed on the Nason yesterday morning and started sanding in the afternoon. I found it to be a little harder to sand than the Turbo 2K but it was manageable. Since I was doing spot filling with it I had to be careful not to oversand the Turbo 2K but by using a 10" soft block to work down the Nason and a 30" stiff block I think it turned out ok. That was all dry sanding. Today, I'll wet it and see how it looks under the lights.
 
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