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The best option to repair the roof, is to sand/scuff the area around the crack with an 80 frit sandpaper, allowing 50mm min beyond the edges of the crack. This will key surface. Clean down with acetone. If the crack is very open and frayed, then cut back the edges completely to expose the board underneath. Again sand the surface of the board with sandpaper, clean off the dust and wipe with acetone. Apply a layer of glass strip over the crack again 50mm wider than the actual crack area, and laminate with resin. Ensure to consolidate well, making sure no air pockets or creases appear. This should adhere the glass to the surface underneath and around the edges. Once cured, you may require an additional layer as above, again go 50mm beyond the previous and laminate as above. Allow to cure again and then scuff surface lightly to key. Clean again with acetone and mix and apply and Topcoat to finish.
