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I ‘m in the process of stainging and sanding 2 doors. There are 3 coats of natural stain over well sanded new birch doors. With each coat of stain, I got small “flecks” that weren’t bubbles or brush hairs. I used tack cloth after sanding eacg time. Didn’t really matter because I wiped it down to remove excess stain and the flecks came off. Put on the 1st coat of polyurethane last night, and the same thing happened. It was a brand new natural bristle brush. I didn’t wipe it down like with the stain, so these imperfections are in the poly. Any ideas what’s causing this, how to prevent it, how to remove them? Could it be dust and lint coming off my clothes? I’m very frustrated.
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If your problem is in the poly, then you should use a paint strainer (cone type from Home Depot or "borrowed" nylon stocking). And remember, don't brush directly from the can, strain enough for the task into a smaller container.
This may not entirely solve the problem. There is enough stuff in the air--except for filtered "clean" rooms--that I always expect anything that takes more than about 15 minutes to dry to pick up some dust "nibs". Its pretty much inevitable.
This is why you should always expect to "finish the finish", by using fine sand paper between coats to remove the nibs, and then after removing the nibs on the final coat, it should be rubbed out to the desired level of gloss.
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