For what it's worth, in case anyone's interested in quality interior trim painting, this is about getting an elegant, oil-base paint look. (If you don't see any difference between acrylic and oil paints on trim then this won't be of interest.)
I was looking for advice recently about best options for interior trim painting. I used to use Benjamin Moore Satin Impervo oil, which has been reformulated twice and is now junk, despite having the exact same label on all 3 formulations. (Satin Impervo #235 was wonderful paint that dried to a glass-like finish. #C235 is reformulated and looks no better than acrylic paint. #Z235 is reformulated again. It goes on like oil-base stain, with lots of spattering and obvious brush marks. I also had trouble with it peeling off of radiators.)
To replace Satin Impervo I found Pratt and Lambert Red Seal oil-base satin finish, which gives a beautiful, smooth finish with virtually no brushmarks. It's a bit tricky to use, requiring periodic thinning, but otherwise is as good as anything from
30 years ago. Unfortunately, P&L seems to be getting withdrawn from the market. Even their own salespeople couldn't tell me a store where it's still sold in my area. Their list of dealers was years out of date! Sherwin Williams bought them out some years ago and seem to be deliberately killing the company.So, I've been doing some research. The best option I can find is Benjamin Moore Fresh Start oil-base primer and underbody, topped with Sherwin Williams ProClassic acrylic/alkyd semi-gloss trim paint. Benj Moore Advance is similar to ProClassic -- a "waterborne" oil paint with water cleanup. But SW seems to be a bit thicker and dries in 4+ hours, as opposed to 16 hours for BM Advance. Both dry to a very smooth finish but are thin, like glazes. That's why the underbody is needed -- to give the finish enough thickness to cover fine irregularities. When I tried ProClassic on poplar, over a thin water-base primer, I could actually see some of the poplar grain after
2 coats! (Poplar has *very* fine grain.)Sherwin Williams has several primers I haven't tried, but they don't even make an underbody paint as far as I can figure.