If you have a Roller System, use the white over-cover supplied every time you recover the cover. If you don’t have a Roller System, the cover must be removed and placed completely in the shade. It must never – not even for a few minutes – be left in the sun when folded. This is because the heat generating effect of the cover is magnified immensely when folded, and it will very quickly self-destruct. The results may not be immediately visible, but they can be very serious. There can be so much heat created that the air expansion creates sufficient pressure to force the lamination of the two sheets apart, causing the bubbles to join and form lines of larger bubbles. This is not life-threatening to the cover unless repeated consistently, however, the cover can get so hot that it becomes molten and welds itself together – completely ruining it.