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Body Filler over SPI Epoxy

#1
I know this has been discussed in the past, but Iwant to lay out how I am fixing to try this, and want to make sure I am following proper procedure. I stripped the panels to bare metal, 80 grit them thoroughly, and the main areas I will have to be spreading filler, I even ground with a 36 grit disc. I will be skimming much of these panels with a light coat of filler also, because this car is just plain rough. That is the only way i can get them straight. Anyway, after 80 grit DA and grinding, I blew tthe panels off and wiped them down with SPI Waterborne grease n wax. and let that sit a day (due to some areas having lead in them). Two coats of epoxy (unreduced and the 30 minute induction period done). I waited half hour at least in between epoxy coats. I understand I have 7 days to get my filler on these panels, or i would need to just 180 them and then apply my filler to them. I was going to wait at least 48 hours to insure the epoxy is dry. My concern is is there enough bite to just spread filler over epoxy now? I am assuming the epoxy down on the clean, properly prepped bare metal took care of that, but I've never filled over epoxy. For the most part I have always done my bodywork on clean prepped bare metal. I am using 3M Platinum Plus filler. Is it then a chemical adhesion going over the epoxy with the filler? I know after all filler work is done, I need to re-epoxy areas that show bare metal and move forward. Does this all sound correct? If I am outside the seven day, just 180 and apply another coat of epoxy? Sorry for the long post, just want to make sure i am following proper procedures.
 

Barry

Paint Fanatic
Staff member
#3
Perfect Prep!!!
Up to 7 days just walk up and spread the filler or glazing putty over the epoxy.
If you go over hand sand spot with 180 before applying.
 
#5
Sorry to bring this back, but I want to make sure I have got it right. Once I spray 2 coats of SPI epoxy primer onto the bare metal with an 80 grit DA scratch, I can apply body filler over (unscuffed) epoxy primer 24 hours after spraying but not after 7 days without re-sanding. Is that right?
 
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