Yeah I wasn't being very specific in my question. I have only used what is called "fiberglass" resin. In referance to my question ,I was refering to polyester resins that I recently priced. I didn't plan on using fiberglass mat.Dumb question , but when you refer to bondo for "rounded" corners thats the same as automotive body filler , right? I was just thinking that maybe a 1/4" thick "box" or shell fabbed with a good adhesive maybe and screws (perhaps a challenge) coated with a couple layers of polyester resin would provide sufficient strenth. Also the bondo in the corners would provide more strenth if coated with resin I would imagine. Thankyou very much for responding. Dave

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