| Mould storage: Exposure to light spoils the gelcoat surface, making it opaque and porous. It destroys the pigment and favours migration towards the surface. Unevenly distributed heat creates temperature differences between one part of the mould and another, and this in the short or medium term leads to deformation and surface defects. This phenomenon is exacerbated the newer and more under- cured the mould. Water and condensation make light and heat damage even worse. Dust and dirt are deposited unevenly on the surface, especially in the corners, in holes and in surface cracks. The best solution is to keep the moulds indoors or at least covered by roofing or sheeting, away from direct light, water, condensation and dust. Finally, the mould must never be left empty for long periods. If used for series production the last moulded item should be left in it, failing which at least a light countermould. |