I meant to seal the knots on my trim with dewaxed shellac/sealcoat before priming and painting to prevent bleedthrough, but I got ahead of myself and primed already. Will going over the primer with shellac still work to prevent bleeding, or do I need to sand and start over? I know the shellac will stick, I just don't know if it will do any good.
Dewaxed shellac for knots
primershellactrim
Related Solutions
A better roller frame may actually be the right solution. I used this roller to paint most of my house after giving up on the cheap ones. It does a pretty good job of sealing the ends so that paint doesn't get inside to the rotating components. It's also got bearings to help it roll smoothly.
Unfortunately, I've used it only with Behr interior eggshell paint, so I can't tell you how it will do with primer.
EDIT: Mike B. reports good results with primer for the same roller.
When you say you can see the brush marks, do you mean that they're actually irregularly surfaced? I mean - are we talking just a visual effect or an actual difference in the depth of the paint?
If the latter, do a skim coat with lightweight joint compound and when it dries, either lightly sand OR smooth with a large, slightly damp sponge, then apply primer.
As for your own brush strokes - orient the roller so the roller bar leads your motion. If you're moving right, put the bar on the right. If you're moving left, put the bar on the left. The most pressure will be on the roller bar side, so keeping that side on the "front" of your motion will mean the lighter touch side (the back) will smooth out the uneven strokes as you pass over it again.
Now if its not a real issue with texture, just that your seams are obvious - then just prime it again with a good HEAVY primer, using the proper brush techniques, and you'll be fine. :)
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Best Answer
Sure. The shellac makes a barrier that the tannins can't get through. If you shellac over primer, it's still effective. I have verified this through experience.
As a side note, an oil based primer (like Kilz Original) that blocks tannins by itself will, for most applications, be sufficient to block knots from bleading through. It's also easy to sand out brush marks with the oil-based stuff.