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coventry_eagle
I have seen recommendations for these from reputable frame builders but I haven't seen first hand:
https://www.dinitroldirect.com/product/dinitrol-1000-1-litre-vehicle-cavity-penetration/
http://media.wuerth.com/stmedia/shop/masterpages0000/std.lang.all/02117.pdf
At work, we only use this:
https://progoldmfr.com/product/steel-frame-protector/