Why do people use their fingers to tool a joint, why do professionals use tooling knives to tool the joint? To make the joint look good. Well, maybe. But, truthfully why is the sealant there in the first place? To keep the fluid from penetrating the substrate. Tooling the joint presses the sealant up against the substrate to insure there is a bond. So, the purpose for tooling the joint is to make absolutely sure that the sealant bond to the material on both sides of the crack and/or void.
Shall I go further? What tools do you use?
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