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There is a high temperature tape made for powder coating. Comes in different widths, but it's rather expensive as tapes go, but it goes a long way. I use it to cover the hook eyes to keep the paint out. Never tried it with the fiber guards, I epoxy them in place instead of molding them. I've also heard of folks covering the weed guards with aluminum foil, but don't know how well it works.
No there isnt that I have ever found. The weedgaurd will distort if heated to a temp that will cure the powder properly. Instructions are about 250 deg with a weedgaurd but they distort still and the paint doesnt hold up like baking at 350.I glue in all of mine.Use a base hole pin when painting and you wont have to drill out the paint. Also a fluffy powder wont clog the eyelet. I don't have problem with the hole the weed guards go in, but out of 100 or so I get 5 or six that clog the eye holes up.