Epoxy/Primer/Base-Paint steps

Hi …..before I untape I wanted to check in with hopefully a last question. While blocking with 600 I exposed fiberglass if a couple of very small spots and my question is, do they need spot sprayed or can the seal coat that is done before base application be adequate coverage?
 
May want to spot seal that area before sealing the rest of it. May take 2-3 spot seal coats before sealing rest. I've done it before.
 
hi, close to BC application. I have many wet coats of epoxy applied which were blocked dry progressively 80 to 600 grit. Now I plan to apply a sealer coat of epoxy mixed 1:1 with a 20% reduction using 885 reducer

The epoxy spec sheet is a little confusing to me.

"To use as a Paint Sealer: To use this epoxy as a paint sealer, mix it 1:1 with activator and reduce 10-50% with the proper temperature range urethane reducer (this is very important), induce for 30 minutes and spray with your base/clear gun. Spray one wet coat ONLY, let it sit 2 hours then apply paint. For sealing of a potential problem paint job, apply two coats of epoxy with proper flash times between coats and let it sit overnight before painting. You may basecoat over Epoxy Primer reduced as a sealer from 2-48 hours without sanding. After 48 hours scuff with a gray scuff pad or equivalent first."

Crash suggested a scuff sand after applying sealer which makes sense to me for minor corrections, trash etc. but the instructions imply painting BC right over the freshly applied primer. What is considered a "problem job" to justify 2 coats? If following Crash's suggestion, would it be better to apply 2 sealer coats and scuff sand after 48 hours? What is the max time allowed for BC after sealer application and scuff sanding
 
If you sanded to 600 there is no need for two coats. Just shoot your sealer and go. I denib with a quick swipe of a 800 sanding sponge if needed. 20 percent reduced sealer might have to sit for a few hours or overnight before it can be denibbed depending on temperature.
 
A "problem job" is where you are trying to hold down sketchy substrates and you need the epoxy to act as a barrier coat to prevent solvents from the paint job from digging down into the old coatings and causing trouble.
 
Looking to use the Epoxy as a sealer. Recommendations on what percentage to reduce? Also, am I understanding correctly, that I can seal and then only need to scuff before paint after the 24 hour window? Prepping pieces separately before paint and want to make sure I follow the best process. Also hoping that gives me one last chance to correct my newbie mistakes or fine tune before color.
 
You can reduce 50% and spray your base within an hour or so. If you reduce 25% in the afternoon you can spray your base next morning. At least that is what I do.
 
SPI suggested I seal with 1:1 mix then dilute by 20 % with the slow reducer not sure of the number maybe 885 . Then paint BC the next day. However I am so green ….I’d listen to other users with much more experience than me
 
Thanks everyone. On my timing question, I was curious if it was past the 24 hr window, do I just need to scuff or would I need to reapply the epoxy/sealer as well. My plan was to get each of my parts prepped and in sealer if possible and then scuff all prior to shooting with color. With some of my other very limited experience with other products you had to scuff and reapply to have a wet on wet process.
 
Sealer is normally just before color, be it SS or BC. I consider it like a coat of glue and or a lockdown coating. Spraying sealer days or weeks before you are going to paint is just a waste of time and material, IMO Over night or later the same day for epoxy used as sealer.
 
Blueoval Bullnose said:
Thanks everyone. On my timing question, I was curious if it was past the 24 hr window, do I just need to scuff or would I need to reapply the epoxy/sealer as well. My plan was to get each of my parts prepped and in sealer if possible and then scuff all prior to shooting with color. With some of my other very limited experience with other products you had to scuff and reapply to have a wet on wet process.
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You will not get the added chemical adhesion that comes with applying your base over the sealer the same day or next day. Not really a sound plan imo.
 
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dhutton01 said:
You will not get the added chemical adhesion that comes with applying your base over the sealer the same day or next day. Not really a sound plan imo.
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Thank you! That is excellent education for somebody learning this process. I was thinking of it more sealing the underneath layers not adhesion between the two.

I will adjust my plan!
 
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