Best Pentrating Oil

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My technique for stuck fasteners; spray, tap lightly with small hammer, re-spray. Continue. I have gotten 1 1/4" galvanised shackles which were entirely covered in rust apart using this method and a couple weeks of patience.
Look for penetrating oils which contain tri-flo (can't remember the un-contracted name of the solvent anymore.)
Looking forward to trying acetone/hydraulic oil.
 
I switched to Kroil a few years ago, best thing i ever used. I always keep WD-40 around for cleaning grease and adhesives.
 
Had an old timer tell me they use to get broken off exhaust manifold studs loose by heating the stud and then touching a candle to it, drawing in the wax. Never tried it.
 
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