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Circles, eh? I suspect some kid has been playing with bubbles near it if the circles are only an inch or two across.The detergent residue left by popping bubbles can affect the waterproofing ability of cotton canvas.

If you're worried I suggest you try to rinse out as much of the (possible) detergent residue as possible. Thick towel pad on inside, wet sponge on the other side. Soak and blot (don't rub), soak and blot. Several times. You'll need to get the possible residue out if you intend to reproof btw as proofer won't grip well on detergent residue. So give the rinsing technique a try first and see how it performs next time out. If you're still getting the circle effect try rinsing again. If you do end up reproofing then clean the entire canvas with a recommended canvas cleaner, including any recommended rinsing, then go from there. But it's a big job to reproof a canvas so it's best avoided if at all possible.

Quote: Originally posted by mary-lou on 30/8/2011

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Wouldn't do it any harm to reproof - just buy a can of the stuff and spray the roof on the next dry no wind day

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