I'm sure Dave Root does good work but his DIY kit seems a little overpriced. A 66' roller of spacer, sealant, cleaner, gloves and instructions, $286. A utility knife, extra blades, and gloves are pretty cheap, you probably already have them. A 66' roll of spacer, sealant and guide block for applying the sealer is less than $100, including shipping from DK Hardware Supply.