All timber products should be treated in their final shape and form. Any surface exposed by drilling or cutting must be re-treated with a suitable remedial preservative.
Resealing is a requirement of the guarantee. Rip sawing, thicknessing and planing are not permitted unless the timber is subsequently re-treated to the original specification. Use fasteners and other hardware which are in compliance with building codes for the intended use.
* See Koppers Performance Chemicals Resealing Technical Data Sheet for more information.
