Although mineral spirits odors are not usually dangerous to inhale, they can cause loss of coordination, headaches, or even vomiting in severe cases. If you start to feel dizzy or nauseated while using mineral spirits, exit the room immediately and call Poison Control. Clean your varnish brush immediately after using it. Cleaning your varnish brush immediately after using it will prevent any buildup in the bristles, which can cause your brush to get stiff over time. Make it a habit to clean your brush every time you use it so it can stay in good condition. Don’t let the brush dry out before you clean it
If the mineral spirits do not seem to be doing the job, try adding a little more to the bowl and dipping the brush again.
Avoid using hot water, which can damage the brush.
You may not, however, notice any discoloration if the varnish is transparent. In this case, wash the brush until it no longer seems glossy or coated in a substance.
Do not wrap the bristles with the sticky side, as this can bend or pull them out.
