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Kirk,
Assuming you are going to glass the whole bottom without the UHMW Shoe, I'd just feather the front edge and rough it and the whole bottom up with 80-100 grit and apply a fresh coat of epoxy to the complete bottom prior to adding the glass and new outer chine logs.
I'd add a fairly heavy glass, a minimum of 12 oz or better. There are lots of references in the posts on this forum on how to glass a bottom. You can do a search to find several.
G'Luck,
Dorf
Graphite, "To Have or Have Not, That is the Question." My apologies to Ernest H.
Rick N
After removing UHMW shoe I found a gray glue (which came off easy with heat gun), a thin coat of epoxy (?) and a white paint or sealant of some kind. I am using heat gun to scrape off paint, but I find that in most places the paint is on epoxy but in some places it is directly on wood (see second picture). It is never beneath the epoxy layer. I think the epoxy layer is original and when they removed the original 1/4 ply shoe and prepped the surface for the UHMW shoe, they partially scraped off the epoxy then applied the white paint. I plan on scraping/sanding off all of the epoxy layer because it flakes off if you pick at it. My question is where there is the white paint directly on wood (which tends to be weathered with deep grains), do I need to remove all of the white paint? I am concerned that in areas with deep grain from weathering, I would need to remove a lot of wood to get all the white paint out. I am going to fiberglass, then apply graphite mix top coat, so it wont be visible (The epoxy and white paint doesn't exist on sides of boat). Its just a matter of whether white paint in a few little grain grooves would inhibit bonding of my new epoxy and glass? Is this a bigger problem than removal of a lot of wood to get at it?
Thanks.
My response is the paint won't compromise your future work. It has been my experience, limited as it may be that a fresh coating of epoxy mixed properly applied to clean wood will stick jst fine. You might consider prepping the surface and applying a coat of epoxy and letting it cure. The majority of epoxies have an open "window" of approximately 72 hours for a chemical bond to occur between existing coats of epoxy and subsequent coats. Of course your mileage might vary dependent upon what brand of epoxy you use. You also have to be aware of amine blush which is commonly washed off with water and Scotchbrite pads. If for some reason you don't or aren't able to reapply the epoxy within that window abrading the surface with sandpaper will provide tooth for a mechanical bond to the older epoxy. Recommendations vary, check with your epoxy manufacturer for more accurate details.
Rick N
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