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mobiledynamics 04-22-2012 08:08 PM

Primer Raises Grain on Drywall Paper
It's been eons since I have painted on new sheetrock.
Advice ?

I was priming some exposed cast iron DWV pipe. Using BIN Red Can Shellac based primer.

While I had the brush wet with paint...I decided to prime a new wall - 2'x3' area as I wanted to paint some test paint swatches on it.

On the areas where there was mud, the primer dried well and smooth.
On the paper, it raised the grain quite much.

Now I know I should be sanding after applying primer..
It's been awhile since I have painted on new rock.

Does primer generally raise the grain on the paper that much & or is it because I was using shellac based primer.

Brushjockey 04-22-2012 08:51 PM

Shellac and oil will do that , a waterbased primer usually will not.

jsheridan 04-23-2012 05:07 AM

Was it raised grain, or furries from oversanding that were hardened by the primer? BIN is spec'd for new drywall. We did a job yeeeaaaars ago for a professor who hired his students to sand all the new drywall, and then apply oil based primer. They sanded the heck out of it and then the oil locked down all the furred paper, the final felt and looked like eighty weight paper. What a mess. We had to sand all the walls with a palm sander and heavy paper. In his effort to save a few bucks, he ended up costing himself much more than had he not, and the final job was inferior to boot.

mobiledynamics 04-23-2012 07:07 AM

I considered it was the feathered edge of JC to the paper. But I don't think it was furred paper. Just found it interested. It's clear as day. Primer leveled even with a cheap a@# chip brush and is nice and smooth on the mud. Just how it extends into the paper, it's all raised and grainy. And yes, it's quite pronounced. I was planing to take 100 and knock it down.

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