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Discussion Starter · #1 ·
Hello I have a coat of epoxy primer and Nason's 2k urethane high build primer on and may need to add some more evercoat filler to straighten out some panels. So how do I go about reapplying more filler?

- Can I apply the filler over the nason 2k urethane primer and then shoot that primer back over it when finished? or



-Do I need to sand down to the epoxy primer and apply the filler on top of the epoxy primer? or



-Do I need to sand all the primer off and start on from the my last coat of filler?


thanks guys!!
 

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You can abrade primer with some 80 grit and apply skim coat polyester glazing putty. Just to straighten out panel. I would use some guide coat also to see your lows/highs.
 

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brandonA. said:
Hello I have a coat of epoxy primer and Nason's 2k urethane high build primer on and may need to add some more evercoat filler to straighten out some panels. So how do I go about reapplying more filler?

- Can I apply the filler over the nason 2k urethane primer and then shoot that primer back over it when finished? or
-Do I need to sand down to the epoxy primer and apply the filler on top of the epoxy primer? or
-Do I need to sand all the primer off and start on from the my last coat of filler?
thanks guys!!

You can sand the Nason and then apply the filler over the Nason..Then put the Nason over the filler.. ;)
 

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Discussion Starter · #4 ·
So if I am understanding correctly just sand the 2k Nason high build primer and put evercoat over all the layers of primer and spray a coat of 2k high build primer on top to level it out... I think I got it thanks!!!!!!!!!!
 

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Well when I was learning, I was taught you could apply filler over epoxy or metal, but over a urethane 2k or paint you should use one of the finishing fillers and only in moderation, and that regular filler would not adhere and feather properly and reducer in the primer you applyed over it could get under the edge.
I don't know what kind of differences there really is in the makeup of a regular filler and a finishing filler, other then resin content and the finishing filler spreading smoother and sanding fairly easy. The finishing filler often runs more for a quart then a gallon of filler. There are so many different fillers out there, and they may have variations in recommendation on how they should be used.
But that said, I've applied some regular bodyfiller over roughed up 2k urethane before with no apparent problems, and believe I did apply a thin coat of filler over some areas like that on an old car that I kept 6 years. I still wouldn't be comfortable applying filler over paint, other then maybe to fill something like a stone chip.
I believe that body fillers have advanced and have better adhesion then years ago. Years ago, it was recommended to apply fillers over bare metal ground course with 36 grit. Then many started recommending applying epoxy primer first and then applying filler.
Today it seems that most filler will stick just fine to a 80 grit sandscratch.
If in doubt, talk to your filler manufacturer and see what they have to say. I wouldn't sweat it so much applying over your urethane if you rough it up well with something like 80 grit first, and don't need to lay it on really thick.
 
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