Mineral Spirits Vs Acetone

I started some general painting around here a few months ago, mostly concrete so both water based and oil based paints. The paint brushes I use with the oil based paints never seem to get cleaned up with general thinners or mineral spirits.

I was in a bind the other day when the neighborhood kid stopped by on a Sunday looking for an hour or two of work. All my two inch paint brushes either turned up missing or dried stiff after my previous attempts at cleaning them. I got out the mineral spirits and thought with enough swirling around in it I could rejuvenate one of them--nothing doing.

In desperation, I brought out a glass quart bottle labeled "industrial acetone" that was not quite empty yet. About sixty seconds in the acetone and the brush was almost like new again. All these labels suggesting clean-up with thinner or mineral spirits had given me false hopes all this time. Put the kid to work and we were both happy campers.

The only question remaining is if the acetone damages the bristle brushes somehow, seeing how strong/effective it is?

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