This product is very easy to work with! My advice: if you're in trouble, give yourself some leeway. I would draw a line by eye with a razor and cut it out with scissors. Then I took my razor blade and carved it down to fit. I have round windows in my RV and it was very difficult for me to fit something but it was easy. I didn't measure anything! There are a few cracks that appear very small and if you are working with natural stone they are still there. You can always cover the seams with a neutral caulk if you like. But to be honest, you only notice that if you stand there and look. In my opinion anything that looks good from 3ft is a winner. . But the stickiness of the adhesion on the tile is very sticky and will work fine. I don't normally write reviews, but this product really impressed me. I almost ordered something else which I know I won't like. So glad I put this in my cart!
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