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my first coat of base is a reduced coat of epoxy .

Dan, epoxy is so chemical resistant, atleast good ones, that the base wont bite into it at all. Think about this...you can sand...

Exactly Jim, heavy polyester type base do not have the same adheision of a polyol base .

i will add this as well. i think it depends on the base you are using. i could sand epoxy, any epoxy, not just spi, that was 3 days old...

So, why does this happen? Why can base be applied over sanded urethane, but not sanded epoxy? Both being several weeks old.... And what...

if the rubber is flexible pvc then paint will bond. if its regular black rubber like on a tire, etc, then that is not pvc and it wont...

i will add this as well. i think it depends on the base you are using. i could sand epoxy, any epoxy, not just spi, that was 3 days old...

Here is best example of what Jim is saying. How many production shops over the years have scuffed a new factory ecoated panel and based...

You dont spray base on epoxy that is more than 24-36hrs old regardless of sanding. 7 day window applies more to urethane primer or sealer

If part is a rubber that you can depress with a fingernail, paint may bond now but fail later. Think I'd tape that part with pinstripe...

You dont spray base on epoxy that is more than 24-36hrs old regardless of sanding. 7 day window applies more to urethane primer or sealer

Well pvc requires no adpro. Wipe it down with acetone and a rag to clean it and prep the surface then shoot a coat of epoxy primer on it.

Your welcome. While this is a paint related forum questions don't need to be solely paint related. The members here are some of the best...

Just to confirm: Scenario 1: Month+ cured 2k urethane primer sanded 400-600 scratch. Scenario 2: Month+ cured epoxy primer sanded...

I had that happen. I put the plastic plate behind the nozzle in backwards.