Trying to paint 8-foot high plain doors i.e. no raised panels but still have a lot of brush marks after it is dry. After I sanded the old surface, I undercoated with Behr 75 Enamel Undercoater Primer and Sealer and then used a Prudy 3" brush, Behr semi-gloss paint and Floetrol Latex Paint Conditioner. I applied the paint in a vertical direction i.e. parallel with the longer side of the door. Any ideas how to eliminate or at least minimize the brush marks. Should I use more conditioner? Bigger brush? Any help would be greatly appreciated since I have 12 more of these to do.

 

you have a couple of options
latex or oil
oil should level out by itself
latex you should try a 4 inch foam roller, but soak the roller and work in the paint to get rid of thr air bubbles
when using a laex you will never get a glass finish due to quick drying
good luck

 

12 more? Might be time to rent a sprayer.

Floetrol strikes me more as something for spraying. I have not found that latex paint needs anything added to it.

For a slab door, I would use the shortest nap roller I could find. No brush marks, goes on fast. Large, flat surfaces are difficult to paint well with a brush, but I guess you already know that. Make sure that there are not brush marks in the primer to telegraph through to the finish coat.

 

Thanks for the suggestions guys. I will try the roller ideas this weekend and let you know the outcome. Good of you guys to give of your time to these issues
Again thanks --

 

Thanks to your suggestions I now have some very nicely painted doors. Here is what worked best. I used a 6" hotdog Ultra Smooth roller from Home Depo. I mixed the paint 3 parts paint/one part flowtrol. I found it is really important to roll the roller on a scrap piece to eliminate air bubbles. After completing the whole door, the finished appeared like it had a very fine orange peel effect, but once dry it is virutally indectable. Thank you for your suggestions and help.
Joe