Well I dont know it all, but I've used it for a few years.
Stain-WB will work but will raise the grain..Alc will work better and wont raise the grain and can penetrate better than OB stains. I use minwax OB wood finish stain, Ive seen a little bleed off when dipping in profin not much though. Varithane stains bleed off alot more IMO. You could always wipe on the first coat after staining, then dip the remaining coats.
Crown paint- Ive used Krylon & Rustoleum OB & WB spray cans without issue.
Cresting paint- I use 99% Testors OB enamel & some acrylic enamel and Whisperingwind Ac enamel. None have had an issue when dipping in profin or minwax OB poly.
The ONLY problem I've had with cresting running is with OB metalics ie. gold & silver. they will run no matter how long you let them dry first. Use a WB acrylic for these and you will be fine, I use Whisperingwind paints for this.
Tip - Let your finished cresting dry till the next day before dipping and a day between dip coats.
Thats what I know..
Have fun..
Eric