Glue will not stick to silicon. When doing a silicone + (insert your covering material here) it is a one shot deal. If you have bare spots after that than it is time to get creative. You can pin some moss over it to hide it. Put a plant in front of it to obscure it. Or leave it. Your frog won't care which method you chose as long as the temps and humidity are right. All the rest is for our benefit.