I have just built a 48 inch hull for a gas boat that will take a weedeater engine. It is still in the rough made from luan plywood 1/8th inch. How should I finnish this to make it fully waterproof? When do i paint it and can i stain it instead? Basically, how do i give it a nice finish? Im open for ideas of design. Finally, I want to put some stickers on it. How and when do I put them on? Thanks guys.