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BZWAK 10-14-2011 08:52 PM

Sanding Primer Woes
I built a study desk out of 3/4 MDF unprimed. Craftsman style.
Blew it off, wiped it down, ample dry time.
I primed it W/ Zinsser Plus water base. Let Dry 3 days.
Attempting to block sand w/ 100Gr paper, the primer is rolling or balling, not turning to a nice dust. Ambient temp was ok. Humidity ok. I had this issue once B4 but can't recall the remedy. Please help!:(

kkeith 10-14-2011 10:24 PM

There are specific primers made as enamel undercoats which are designed to sand and powder out. Sounds like your primer was more of a general purpose primer, and latex tends to sand just as you suggested. At this point re-prime with an enamel undercoat, and is should sand well.

jsheridan 10-14-2011 11:45 PM

You might try using a finer paper, like 150. 100 may be cutting too much.

BZWAK 10-23-2011 10:37 AM

:)Thanks for the help! I switched to 120gr and a ROS. The tiny strokes I think is what produced dust rather than the balling.
Also, you are correct on the type of primer. Lesson learned, Thanks Again!

jsheridan 10-23-2011 11:16 AM

By ROS, I think you mean an orbital sander of some type. But, it could be a Robot Operating System, a Reactive Oxygen Species, or a Return On Sales, according to Google. Since I don't think any of those would contribute to easier sanding, most especially the Robot Operating System, I'm assuming you meant some type of orbital sander. But, either way, I'm glad you solved your problem.

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