Even the most troublesome leaks can be sealed with Check Mate Check Mate is an outstanding water resistant sealant that prevents water and air infiltration through pronounced cracks (called checks) in logs, timbers and wood siding. Caulking is an obvious solution to this problem, but caulking does not work because of limits in adhesion and weatherability. As a check filler, Check Mate forms a tough elastic filler and coating. It has superb color stability and resists It's especially important to seal upward-facing checks that will accumulate water. Otherwise, these will be sites where rot will start in the logs. Checks that occur on the sides of a home exposed to excessive wind or rain should also be filled. The Check-Kit includes two tubes of Check Mate and 50 feet of Backer Rod. Click Here for More Detailed Information