Is primer necessary over oil-based paint when repainting?
We are remodeling a house that was built in 1941. The house has not been painted in years, and all of the trim is oil-based paint. We are going to be painting over it with zero-VOC paint by Safecoat. We are gathering estimates now, and the painting estimates are varying dramatically! Some painters have told us that we need to vigorously sand and prime the trim before it can be painted. Others have said that we just need a light sanding and no primer. I want to find a good price for the painting, but I also want to make sure that the work is good quality. Any input on the best way to handle painting over oil-based trim? (One painter also suggested using a chemical that roughs up the trim on its own, but I am not too keen on that idea since my husband has chemical sensitivities.)
Thanks in advance for your help!