Another possible option, is have your local steel supplier/fabricator, cut your steel square stock to your specs. Use this paint to rustproof the steel, then clamp. drill and bolt with Stainless bolts and nuts, the kind with the nylon lock washer built in. Then just touch up any spots you may have missed.

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Follow the prep directions too the letter. This stuff is like ceramic when hardened. Not cheap, but will last a lifetime if applied correctly.