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Sealing a floor's expansion joints or a stone wall's cladding when caulking is used!
And other issues with caulking and sealers.
Flooring expansion joints and/or caulking:
Stone cladding and caulks:
Some contractors have had very good success by using a shallow galvanized pan to dip the slate face for a few seconds, then stack on edge to dry. By dipping only 1/16th to 1/8th of an inch into the liquid, the sealer is drawn into the slate by natural absorption. This will achieve good sealer penetration, but edge contact is minimized so that the caulk will have some unsealed surface for maximum bonding.
Caulking and sealers in general:
Usually the concern is bonding. Will the caulk bond to the sealer? Will the sealer bond to the caulk?