SPI Epoxy mixed 1:1:1, 3 weeks ago, can I scuff and paint?

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danford1

This is a hypothetical, but maybe reality question.
Here are the steps taken then my question. Sand bare metal with 80 grit, 700-1 clean up, an hour later SPI epoxy mixed 1:1 (2 coats).
2 days later bondo, sand, 2 coats spi epoxy.
Then 2K turbo sprayed, sanded, then SPI epoxy mixed 1:1:1 as a sealer.
3 weeks will go by before base coat and UV clear can be sprayed. Can I wet sand the sealer epoxy with 600 then shoot the base coat/clear coat?

Danford1
 
Some might say to spray another coat of epoxy sealer, but I would have no problem sanding and going straight to color.
 
if you sand and go straight to base you will without a doubt have terrible adhesion issues. if you do base it, everything will seem fine initially but you will be stone chipping very easily. if you were going to do any kind of masking on the base to say do a stripe or something then i guarantee the base will come off when you pull the tape. there is no real reason to spray your epoxy sealer until your ready for basecoat. your sealer should be like its your first coat of base. once your 2k turbo is sprayed and sanded then thats where you should stop until your ready to seal, base and clear.
 
Epoxy mixed 1:1:1 usually goes on very thin, I hope you don't break through to the turbo 2K.

Basecoat on 3 week old epoxy may not give you the best adhesion bc the epoxy has such high chemical resistance, the solvents from the base may not really bite into it.

As usual, make sure to activate the basecoat for added strength.

If I'm in the wrong with my reasoning I hope the more experienced pros will chime in and set me straight. I hate to sound like a Debbie Downer here.

Best of luck with your project Dan.
 
Danford listen to Jim. He's spot on. If it's worth doing it's worth making the time to follow the correct order of things. Mix your epoxy 1:1:10% 1 coat and you can base it in 2 hours, up to 18hours or so. Don't see any need to go 1:1:1. Way too thin in my opinion.
 
Chris_Hamilton;n82476 said:
Danford listen to Jim. He's spot on. If it's worth doing it's worth making the time to follow the correct order of things. Mix your epoxy 1:1:10% 1 coat and you can base it in 2 hours, up to 18hours or so. Don't see any need to go 1:1:1. Way too thin in my opinion.
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I have the deepest respect for anyone that can lay a slick coat of epoxy at 1:1 10% reduction as a sealer.

Maybe I need to play with longer induction times or switch to a 1.3 basecoat gun.

I prefer the 1:1:1 mix because it flashes faster and it's possible to denib in about an hour.

So much to learn still.........
 
as a sealer i also reduce up to 1:1:1. when i apply it its more like just an adhesion promoter to get the bc to fully bond. of course it wont fill sand scratches at that reduction but it does lay slick. if you need to fill irregular hand blocking scratches then a 10-25% reduction is fine but you do need to watch your ass that you dont get it too heavy or double coat it anywhere because it wont lay smooth.
 
Ignorance is bliss I guess guys. Lol, I've got limited experience with the SPI, I've only mixed it 1:1:10% when using it as a sealer and haven't had any real issues. 1.4 Sata 2000 HVLP.(my sealer gun). Just finished up a Corvette using that ratio and it laid down nice and smooth. I have noticed that it needs a little more air pressure to lay down. I'll try it reduced a little more next job I use it on.

How is coverage at 1:1:1 ? Using the white on this Corvette that I did I noticed that one coat at 1:1:10% didn't really come close to covering. I did 2 coats on a lot of the parts just so I'd have coverage.
 
Reduced 1:1:1 it definately does not cover. It would take a couple coats. Its perfectly fine to use at 10%. You just have to be careful not to spray it too wet.
 
I'm curious, are you talking about the 66xx line of epoxy mixed as a sealer? I only ask because in the product manual it mentions when used as a sealer to mix 5-50% reducer. When I shot my car I used 50%. I didn't know you can go beyond that percentage.
 
MikeS said:
I'm curious, are you talking about the 66xx line of epoxy mixed as a sealer? I only ask because in the product manual it mentions when used as a sealer to mix 5-50% reducer. When I shot my car I used 50%. I didn't know you can go beyond that percentage.
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1:1:1 is exactly 50% reduction, I wouldn't go higher than that.

It's been years I have shot the white epoxy as a sealer but I remember mixing a bit of black epoxy in it to make a very light gray instead for better coverage.
 
Everyone's style is different, I find mixing 1:1:30%, shooting the sealer in the evening and painting the next morning to be the best sealer system for me. 1:1:1 doesn't fill scratches well, or give confidence that it is isolating the substrate.
 
Jorge M.;n82481 said:
1:1:1 is exactly 50% reduction, I wouldn't go higher than that.

It's been years I have shot the white epoxy as a sealer but I remember mixing a bit of black epoxy in it to make a very light gray instead for better coverage. .
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OK now...I see how that is derived. It makes sense now.

Thanks Jorge.

Mike
 
Last time I used epoxy as a sealer, I mixed it "per the perfect paint job", and was worried that it wouldn't lay as flat as when I had mixed it 1:1:1 in the past.

Afterwards I couldn't really tell any difference in how smooth/level it was, and it seemed to cover much better.
 
Thanks for the replies guys. I'll heed the advice and spray another sealer coat of epoxy before I base it.
Thanks again.

Danford1
 
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