How do you paint over gloss?

We have some indoor trim that needs painting. In some places knots are bleeding through. Kilz or Zinser was used originally to deal with the knots. I assume not enough of that stain killer was applied.How do you paint over gloss?
Kilz or Zinzer primers will help a lot, but nothing will work very well while it is still shiny. Your best bet is to lightly sand the surface and then wipe it with a tack cloth, or use a liquid deglosser, or at least wash it with TSP before painting.How do you paint over gloss?
u have to wait till the paint dries
lightly sand until the gloss finish is gone. then prime with two or three base coats. Folow up with your finishing color. you should get the primer in a tinted color as it will help the knots from showing through. ( like if you want to paint red, go for a dark pink tinted primer. Kilz makes tinted primer and tinted paint now. )