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small fibers/sediment here and there on painted walls

Just repainted the interior of my house and have noticed in some areas that there are chunks of debris -- mostly fiber threads -- that must have gotten into the paint and are now stuck on my walls. This is particularly noticeable in one bathroom where semi-gloss was used. They're all over the place -- threadlike fibers everywhere. Is it possible to lightly sand these fibers off and then repaint... will sanding even get them off? We carefully used blue painters tape on the rollers to get off any fibers that may be loose, but then (foolishly?) stored the rollers in the cans of paint until we were ready to paint somewhere else. Do you think this is likely where these fibers all came from?

Re: small fibers/sediment here and there on painted walls

Probably. There is no economy in using cheap rollers.
Other than scraping & repainting, I don't know what else to do. It happened to me once too.

Re: small fibers/sediment here and there on painted walls

Sounds like you may have made one or more of the classic DIY painting mistakes. First, the classic mistake of trying to use new rollers after only defuzzing them with tape (and risking leaving adhesive residue on the roller fibers). You're supposed to pre-wash them and let them dry before ever using them (even if they appear to be totally sealed from the store dirt, then defuzz them.

Over-rolling areas will also tend to pull out the fibers (trying to stretch too little paint over too large an area), as will overworking the paint (continuing to roll over an area excessively after the paint has already started the curing process/skinning over).

Selecting the right rollers for the surface finish, and right type of paint is also important, i.e. using alcohol based primers or other solvent based paints with rollers made for use with water based paints. Rough surfaces (like accoustical ceiling surfaces, spatter finishes, stucco, certain textured wall finishes, stucco, etc.) can really chew up rollers, and when rollers show any sign of being torn up you must replace them with new, washed, de-fuzzed and pre-primed rollers.

The particles other than lint fuzz sound like you contaminated your rollers as well.

Could be you had a dusty, gritty, fiber ladden situation and the fibers and grit were stirred up while the paint was curing (breezes from furnace, open windows, etc.) also a no-no.

Sanding may be your only recourse. Surfaces other than drywall may need to be chemically stripped, scraped and sanded.

Using a paint can to store wet rollers, if you totally submerged the rollers in paint or water and left them there for any length of time, this too will tend to rollers and cause at a minimum fibers to release from the affected core.

Best practices are to wash your rollers between uses, and pre-prime (with water then squeezed out/spun if using water based paints, or with ammonia or alcohol if using shellac, or paint thinner if using oil or solvent based paints) before beginning the next paint project, delinting when dry as necessary) your rollers. If using water based paints and the rollers aren't over loaded, and starting again the next morning, you can use a roller cleaning tool to remove the majority of the paint in the roller, place the roller in a re-sealable freezer bag, seal, and set in the refrigerator overnight to resume the next day. Although some claim this can "hold" a roller for up to 2 days, I wouldn't recommend continuing without cleaning the roller for more than 10 hours, assuming you removed all excess air from the bag before sealing, there was no paint even close to drying anywhere on the roller, and double bagged the rollers if there is anything odorous in the refrigerator or foods that might be effected by the fumes that might escape from the bag. If any paint even partially dries on the roller, as soon as it recontacts wet paint on the wall in the rolling process it will leave behind bits of skinned paint and the roller fibers that pulled off along with it (and always wash down the roller holder, and never store it with a wet roller on it).

Of course starting out with a properly prepared, freshly washed, de-gritted, de-linted, de-greased, sanded or abraided if needed, painting surface, in a clean zone would be necessary to acheive a good painting result, as would protecting the area from stirred up airborne debris until the paint surface dried.

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