Hi, I need some urgent advice please. I am making a mould for a bike heat shield. I am using the green Tooling Gel coat. When I demould the part I get lots of damage on the gelcoat surface. Especially at the edges bits break off very easily and around parts where I will need to drill in bolt holes. The damage does not appear repairable. I need your urgent advice as I need to finish this part this week. Thanks