Could I specify STAIN-PROOF Original ™ on pool copings (French Limestone) which will be 2 to 3 inches in water 24 hour 7 days a week?
Our products are not recommended for surfaces constantly underwater. The reason is that they work by stopping capillary suction and under constant water pressure the repellency is overcome and water penetrates via permeation. The time it takes to overcome the repellency depends on the pore size of the stone and the water pressure. With a one metre pressure head it could take treated concrete 18 months but with 3 inches of water over porous bricks it could be days. Having said all that, if the stone is exposed to the air and allowed to dry regularly the repellency will be restored and the ‘clock’ starts again. An alternative is a clear epoxy coating, although epoxies have a lot of other problems. If an architect or engineer insists on using an impregnator then make sure the entire stone is dipped sealed in DRY-TREAT 4OSK™ and then when the stone is fixed in place apply the STAIN-PROOF Original™. The DRY-TREAT 40SK™ is a particularly good water repellent for low silica based stone. Note
