Last one to post in this thread wins!

69conv said

Haven't heard of cavity wax. Sounds like it seals inside openings. What do you use?

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Most body shops use it after replacing a panel on a car 3M makes it. Comes with a long wand like a 4' straw that you stick in the frame rail holes and spray it in and it covers the entire inner frame with a wax or cosmoline I think it's called.