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Unread 01-22-2020, 06:50 PM   #8
Moderator -- Mud Man
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Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 33,134
A penetrating sealer won't peel off like a sealed piece of wood would do. It's designed to stop food stains and to allow the surface to breathe.

I think damage from the acid depends on how strong it was used. If you used it full strength then you likely did some damage. Used too strong, the acid will eat away the cement in the grout leaving the sand behind. Like others said, I wouldn't use it inside.
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