Varnish is a great sealer for making wood coasters waterproof. When compared to other finishing solutions, it has a high solids ratio. Spar varnish can be used to protect the coasters from scratches, as well as to waterproof them. You can also consider using Polyurethane, which has both water or oil-base. Oil-based polyurethanes are more durable, but they can also give a slight tint to the look of the coasters. Polyurethane coats can protect coasters from heat, which is especially useful if you use them to hold coffee or other hot drinks. One downside of polyurethane is it takes a long time to cure.
Recent Content
Be sure to ventilate the bathroom well with extractor fans or windows. Clean up any spills and wipe down moist surfaces to accelerate drying. Reapply the sealant regularly to maintain the protection...
What precautions should I take when using wood in a bathroom?
Be sure to seal all joints with a bathroom sealant or caulk, and where possible, select wood that is naturally durable, like teak, cedar, or mahogany.