Harbor Freight Tools Horsehair Bristle Acid Shop Brushes, 1/2-inch, 36 Pieces

During the winter a little condensation forms on the glass that makes a mess of the lower wood of the window. I use these brushes in the spring to touch up the varnish because they are the perfect width to touch up the wood at the bottom of the window. This prevents wood rot and keeps the windows looking great. A small price to pay as apposed to $3000.00 to replace a window (these are large windows). I clean the brush when I am done. therefore I have not used very many. These will last for a long time.

I’m a guitar tech and I use these for a lot of different things in the shop. They are built really well so I don’t have to deal with the bristles falling out and getting into places that they shouldn’t be. They are are slightly bigger than I need so I frequently have to trim them down a bit and again they’re built well enough so that I can do that without any issues. Definitely worth the buy.

I don't use "acid" brushes for anything to do with acids. I use these in small automotive and electrical cleaning activities. For these purposes, these brushes do very nicely and are virtually indispensable in my garage. I like that the package contains 36 brushes - they do get dirty and are not really something worth trying to clean and retain. The bristles are plenty long for very soft cleaning jobs or for applying thin layers of grease to a part, but they really shine when one takes a scissors and cuts the bristles to 1/4" - then these can be used for very tough cleaning tasks and are SUPER. I can't work without 'em - recommended!

Good hobby disposable brushes. Have bought these twice now. The bristles don't fall out easily.

Great price for the amount of brushes you get. Do not pull very hard on the end or the bristles will come out. They do lose bristles easily but that is to be expected for the price. If you are going to use these on something that is critical that you want absolutely nothing left behind, such as gaskets that need and excellence seal free from contamination I would use a higher quality brush. Nothing is more irritating trying to get a hair off of sealent you just put down. If you are just spreading dielectric grease, anti seize, grease or other products that are not as critical, these are great. You just throw the used one away instead of trying to clean it for next use as you have plenty that are new.

Only four stars because the Aluminum handle holding the bristles is not crimped well. The bristles will easily come out if the handle is not modified. Place the brush in a serrated jaw bench vice so the jaws will contact about 3/8 of the Aluminum handle starting at the junction where the bristles go into the handle. Tighten the vice so the serrated jaws imprint on the Aluminum handle and exert pressure on the bristles effectively crimping them in place. Doing this prevents any bristles from falling out of the handle. This simple modification makes this brush a very useful inexpensive brush for many uses and will not leave bristles behind .

Used these brushes with seam sealer on an auto restoration of mine and worked flawlessly. Yea, they are a bit cheap, you lose a few bristles here and there, but what do you expect for 36 brushes, at this price they are disposable. I imagine these could be good for many tasks, like cleaning out your keyboard/computer, vents in your car, manually pollinating your garden, etc

I have used these brushes for paint/stain, paint remover, greasing and grease remover, and a bunch of other things. I read a review about the bristles coming out, but I just use a pair of pliers to tighten the cover and they hold just fine! Definitely worth the price!