Hi, I wonder if you can offer some advice please. We have a flat roof covered with Trocal (approximately 20 year's old). Yesterday I noticed 2 small punctures in the fabric; they look like they may have been caused by melting of the fabric (maybe by a small chemical spill - we have recently had triple glazed windows fitted by an over-rated company & I think they may have caused the damage). My question is is there a repair patch that can be purchased or some other way of repairing the damage? The holes are each about 3 mm wide.The roofing fabric is in otherwise good condition. Cheers.