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Dear Art Benstein,
Hope you're well. Yes. For automotive uses - e.g., waterproofing electrical connections, making "gaskets" to stop leaks, etc., etc. - any butyl tape will do. That is, when the water is not pressurized, butyl's stickiness and flexibility suffice.
The product I used today no longer is made by 3M (or if it is, I can't find it). That doesn't matter, as I have several rolls and don't often need it. For the record, the discontinued 3-M item I used is: Press-in-Place Roof and Gutter Caulk. This is a 1/2" wide x 1/8" thick tape.
Despair not. See: http://www.bestmaterials.com/butyl-rubber-sealant-caulk-1103.html . While I've not used this product, it seems to match the one I used.
Thus, when I installed side-marker lights, I used butyl tape to wrap the splice area, even though it is under the hood. I wanted to keep humidity from causing corrosion on the connectors. The cost of butyl for such uses truly is "pennies".
Indeed, in repairing the ABS/Speedo sensor harness at the differential, I not only wrapped the wire harness splice near the differential, I put a butyl cap on the machine screw, that secures the sensor to the diff cover.
The screw came loose with a little PB Blaster. Before reinstalling, I coated the screw threads with nickel anti-seize, put primer paint on the screw head, and then covered the screw head with butyl. Should I ever have to remove that screw, I'm pretty sure it will turn-out with no great effort.
Hope this helps.
Yours faithfully,
Spook
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