Join Date: Jan 2003
Location: Maine Coast
Thanked 311 Times in 241 Posts
Rep Power: 18
I have removed lots of screws suffering from stainless/aluminum corrosion over the years. There is no panacea that I hove found as of yet. Heat on spars is not a good method or practice....
Be very, very, very careful as the stainless is soft and impact screw drivers can often just twist the heads off before breaking the bond. I have found impact to be the best method but in the form of a cordless impact driver with about 1200+ beats per minute. These BPM's tend to fracture the white, nearly welded corrosion, with less chance of twisting the head of the screw off before it finally gives up its hold. This is not to say you won't twist off the heads still but I do find the success rate using a cordless impact driver about the highest..
Sadly PB Blaster type products do not tend to work as well on this type of corrosion. A few good taps with a drift in the center of the screw head then an impact driver, not an impact screw driver that you hit with a hammer, I have found to be the best and highest success rate method. Ryobi makes a good inexpensive 18V impact driver..
Good luck stainless/aluminum might as well be welded. Use Tef-Gel when re-installing the screws and they will come out in twenty years with ease..
-Maine Sail / CS-36T
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Last edited by Maine Sail; 03-08-2010 at 05:53 PM.