Cleaning Filler/Poly Primer Before Epoxy

D

desertspeed

What’s the recommended way to clean sanded filler and poly primers prior to spraying more epoxy? Given that they will absorb water and W&G remover?

I’m assuming just wiping down with a dry WypAll and maybe even blowing air, although I’d hit the blow gun on a mirror or masking paper for a minute or two to check for contamination.

Thanks!
 
Blow it off, then wipe it down with either water based W&G remover like SPI 700 or solvent based like SPI 710. Give it time to dry before you spray more epoxy. You can help the filler areas along by blowing air on them. Moisture absorption is a long term issue, nothing to do with getting your work clean, before applying any coating. Just give the filler areas plenty of time to dry before spraying. Like I said blowing on the filler areas with compressed air will help dry them quicker.
If you are worried about contamination in your air then you need to address that before you spray anything more.
 
I see no reason to use anything wet, including W&G on freshly sanded filler.
It's just asking for trouble.
Any moisture in filler can last a long time.
Tack it off and prime it.
The time to clean the area is before the filler.
 
jcclark said:
I see no reason to use anything wet, including W&G on freshly sanded filler.
It's just asking for trouble.
Any moisture in filler can last a long time.
Tack it off and prime it.
The time to clean the area is before the filler.
Click to expand...

Done it for years, never an issue. Mostly have used solvent W&G remover to do it but nothing wrong with using waterbased (especially if you epoxied first). Blow it off with compressed air until you see it dry. No problem.
I do it because even freshly sanded if I have run my hand over the panel I want to eliminate that chance at contamination. Also if I'm reapplying epoxy, I want a nice dust free surface that I know is clean. Not saying my way is best, just works for me.:)
 
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