The first layer went down perfect. The first layer is still there and is still perfect. It's the second layer that's peeling in small areas.. even when I take a heavy wire brush on it the first layer is like cement... The product can be painted over wet metal and I used 20% distilled water to thin it.. I find it hard to believe a tick of moisture in the line is going to hurt it... I strongly believe it's just like the instructions said if I'm going to put a second layer it should be between the two to four hour time mark not 3 to 5 minutes later and twice as thick... They even talk about the second coat if you're going to use a second coat to be thinner..