Join Date: Jul 2008
Location: San Leandro California
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I don't think you want the hole in the getcoat larger than the size of the thruhull. If the area is cored and not pure glass then you want to prepare it, think dremmel tool here, their are so many threads you can learn from here, really, that can say it much beter than I.Backing plates are easy to make since you have the epoxy and some fiberglass.I would use 4200 when installing thruhull, uv. Take care and the hardest part is drilling the hole!