Hi I recently bought this paint: http://www.sandtex.co.uk/products/sandtex-smooth-masonry-paint/
Im painting onto a window sill that is made of terracotta tile. I used this paint thinking it was the correct stuff, but now unsure.
It was painted on a dry sunny day with plenty of drying time and all seems nice and even to finish. It then rains the next day and leaves a patchy result as though the paint isn't waterproof (although it says it is on the tin). This has happened twice now to me as at first I thought it may need a second coat or rained to soon after application but it appears not to be the issue.
Attached is an example of the issue. The darker part is the the lesser exposed part of the sill near the window, the lighter part is the outside edge of the sill.
Does anyone have any ideas why this may be happening? View media item 76908
Im painting onto a window sill that is made of terracotta tile. I used this paint thinking it was the correct stuff, but now unsure.
It was painted on a dry sunny day with plenty of drying time and all seems nice and even to finish. It then rains the next day and leaves a patchy result as though the paint isn't waterproof (although it says it is on the tin). This has happened twice now to me as at first I thought it may need a second coat or rained to soon after application but it appears not to be the issue.
Attached is an example of the issue. The darker part is the the lesser exposed part of the sill near the window, the lighter part is the outside edge of the sill.
Does anyone have any ideas why this may be happening? View media item 76908