Walls and Ceilings - Banding with knockdown finishes
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txdiyguy
04-17-03, 05:39 AM
I've read back through several threads regarding wall and ceiling texturing. One person asked about priming before applying the texture. For knockdown textures (around here it's called splatter and drag), I've found it necessary to apply two coats of heavy bodied oil-based primer before applying the texture to prevent banding. When I say banding, I'm talking about the stripes and bands that can be seen in a finished wall or ceiling. I believe it to be caused by the different rate at which the spray-applied texture dries over joint compound compared to the way it dries over the paper surface (which nowadays seems to always be some sort of really porous recycled paper). One time I had the tape and bed guys apply a thin layer of compound to the entire surface. That didn't seem to work. I figured it was too thinly applied to have the effect I wanted.
I can't remember the last time I had an orange peel job but I don't think the problem would exist (or be as severe) with that texture.
What are y'all doing to eliminate/minimize this problem?
I can't remember the last time I had an orange peel job but I don't think the problem would exist (or be as severe) with that texture.
What are y'all doing to eliminate/minimize this problem?
awesomedell
04-17-03, 08:16 PM
Round this area we call it spray & knock(down) S&K for short. I have seen the effect you're talking about in jobs that weren't properly primed after texturing.
In this area, on a commercial basis, it's done as follows; Tape coat, fill coats(s) usually two done with either 8" & 12" or 10" & 12" boxes, skim coat, S&K. After that painters come in & do PVA primer (better guys use 2 coats), and finish paint.
You a finisher or a painter?
In this area, on a commercial basis, it's done as follows; Tape coat, fill coats(s) usually two done with either 8" & 12" or 10" & 12" boxes, skim coat, S&K. After that painters come in & do PVA primer (better guys use 2 coats), and finish paint.
You a finisher or a painter?
texdiyguy
04-17-03, 09:40 PM
Basically, I build and remodel. But I do some of my own painting sometimes. Before I started applying the two coats of heavy-bodied oil base primer before they textured, it didn't matter how many coats of primer and paint I applied, banding still occurred. The finishers and painters I've talked to say it's the recycled paper GP and others use nowadays. It appears to me that the paper sucks the moisture out of the splatter more quickly causing it to dry faster than the splatter that hits the areas covered by compound. Then, when they drag (knock) it down with a spray shield thing, the resulting texture looks different over the paper than it does over the compound. No amount of primer or paint will change that. The primer coats applied before the texture seems to seal the paper and the compound areas equally, resulting in a more uniform texture pattern.