Join Date: Nov 2008
Location: Deale, MD
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While I use butyl for some things, it's not for everything...
For big things tha are through-bolted--winches, ports, tracks--it can't be beat. It makes it simple to remove the item later and does not harden.
However, I've used it for screws and been disapointed. Part of the problem is the twisting. However, for small parts I like the adhesive quilities of 5200. If I install a small pad-eye or a guard rail for a heater stack, the extra bond of the 5200 keeps it tight and it will come off easily enough later anyway.
My personal feeling is that unless I can through-bolt, I'm better off with an adhesive. Large items, like ports that are screwed on, I may still go with butyl (the hatches on my boat were screwed on and factory butyl, and were still well sealed and tight after 14 years). But sometimes you need to look at each application and make a judgment.
Other than difficult removabilty, the other weakness of 5200 is that it doesn't keep in the tool box. Even with foil under the cap, 3-4 months seems to be the limit. And so I occationaly use butyl where I should not, simply because I always have it. If it's that or silicone, I know it will be easier to remove the butyl later.
Rugosa is dead on, except I question the foam gasket preference on some occations. I can't even remember how many of the those gaskets have failed and leaked over time in both marine and industrial settings, ruining something. I think I would take that case-by-case; some are good, and some are clearly crap. As for the ooze, it never really bothered me, but I'm quite certain it would botter some customers. Perhaps my climate is cooler.
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Last edited by pdqaltair; 09-30-2011 at 01:23 PM.