I haven't used coraseal but their website reads like ospho, which I have used. I usually clean back about 1/2" on either side of the weld, spray weld through primer of some kind, then get to welding. Top coat with whatever you want after that.Question to the metallurgists in the crowd: outriggers are new steel, frame has been treated with Coraseal rust converter, etching primer, and John Deere blitz black paint. Obviously new clean steel is best but how far into the coraseal conversion should/could I go to ensure a good bond for old to new steel with my glue gun?