How to Seal a Deck with Thompson's Water Seal 13

Is it really necessary to clean my surface before I stain or waterproof it?

In order to get maximum penetration and performance of the waterproofer or stain, it is important that the surface is cleaned of any stains, dust, dirt, oil, soot, grease or other contaminants.Every exterior wood cleaning need is met by the Thompson's WaterSeal® cleaner line.

Yes.Pressure treated lumber is not waterproofed because it is pre-treated with chemicals.The chemical treatment causes the lumber to dry out quicker and absorb more water.As the wood dries, it shrinks.The wet/dry cycles cause wood to crack and warp.

No.The Federal government and the American Society of Testing and Materials have developed industry tests that measure the amount of water repellency in a product.To meet the minimum water repellency criteria, wood products must be more efficient than 60 percent.Most Thompson's WaterSeal® products exceed this standard.