filler putty for fiberglass and ABS... suggestions? - RC Groups

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I am building a boat with a fiberglass hull and an ABS cowling (? They should be seamless, and now that they are glued together I want to smooth out the seam. Can anyone recommend a product that sticks well to both ABS and fiberglass? Both were scuffed fully and cleaned with alcohol, so they are as "sticky" as possible. I was also thinking of using automotive Bondo, but then I need to worry about covering that red color with the gloss white hull paint.

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