I had a abs grille that was peeling.I sanded almost all the paint off.Some parts of it feathered good so after a good cleaning I sealed with epoxy. I waited one hour then laid down 3 coats of spi base waiting 1 hr. between coats. I had a small spot lift that has to be repaired.If I had some waterborne primer I would sand then shoot some over the area then proceed.I am not wanting to buy any so how would you attack the problem? Thanks