Thompson's WaterSeal Multi-Surface Waterproofer, Clear, 1 Gallon

Using untreated wood outdoors will deteriorate quickly unless it's protected. Thompson is my preferred water sealing sealing product. It won't keep the wood safe forever but it does extend its life. My little garden windmill was sealed with Thompson and stayed good looking for 5 or 6 years before i had to cover the good looking wood with paint. My new greenhouse has a particle board floor raised 6 to 10 inches off the ground but to be safe I sealed both sides of the sheathing with Thompson.

Easy to apply by brush. We coated our outside deck and it repelled water nicely. Doesn’t smell badly going on. Be sure to let it dry completely before touching or walking on it. Also do on a nice day, no wind, as leaves and dust will stick to it.