What are the dimensions of the box? The smaller the part the less layers needed to keep it strong. This does not look like a very big project and I would not invest in a cup gun unless you are planning on doing lots more fiberglass work in the future. You should be able to brush on the gel coat if you do it carefully. I would do 2 layers of 1.5 oz matt and 2 layers 1708 and be done with it. I don't know why you would need to core such a small box? Coreing the bottom may provide a flatter surface for your plumbing?.... but I don't think it is necessary. someone help me here......
strick
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