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Just to clarify, would I layup in sunlight working quickly, or under proper uv protection then moving to sun once done?
Always use the UV Sun cure polyester resin in a shaded area and bring the board out in the sunlight to cure. As soon as the resin is exposed to UV rays it starts curing. Takes about 3 minutes in the sun to fully cure.
Going to use this on an mdf enclosure to waterproof it. It will be painted . Does this require a catalyst if it is not going to be used on a traditional surfboard application?
As long as the sun's UV rays can hit the resin no catalyst is needed for the resin to cure. For surfboards, when installing fin boxes and leash plugs MEKP catalyst is required since the UV rays will not shine in the pockets.
Is this product suitable for silicone mold resin jewelry to be cured with a UV (nail) lamp?
Yes the UV cure polyester resin will cure under a UV nail lamp radiation.