Depends on how long they keep the mat down over it. Overnight most likely no change, kept on it for a few days, yes the milky look will begin to take hold.
Yes, I had the mat under Weber grill on new Azek deck for about a year. When we pulled the Matt up to clean deck this spring we found white spots under where edge of mat was and have been unable to wash off.
Hello, We have our pad on a paver patio outside. We have not had a problem with any moisture being trapped. There are no stains under the pad. We have had it for over a year and it has been great!
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From their website: The "Original" Grill Pad® is naturally environmentally heat and weather resistant. You should allow a minimum clearance of twenty-four inches between the heating appliance and The "Original" Grill Pad™ on your deck or patio surface!
If placed on dry deck or patio, the Grill Pad does not trap moisture. The product is designed to lay flat and by its weight will fit flat to your surface.