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Rich,
The section of deck that i used has been sanded, if you have an unsanded section so the pattern is more pronounced, the mold will lock into the deck pattern.

The gun i used for spraying is a 2.5mm tip, the larger the tip the less you need to thin the better. Depending on the gelcoat your spraying, up to 10% styrene or the minimum amount needed to have the glecloat properly spray through the tip your using.