Epoxy vs resorcinol or other adhesives for boat building Answered
I've been a big fan of epoxy for a long time. It's been recommended to me as the best glue ever, and lately as a great/durable coating to be used like paint. It's so popular that companies are starting to market things as epoxies that might be related but, really are something else. FYI anything sold as a "one part epoxy" is not an epoxy at all. it's something else. Epoxies must be 2 part.
My father started building wooden model sailboat, and wanted to use Resorcinol. What?? Never heard of it. can't be good. must be toxic. use epoxy, Dad. Lately, I've heard differently, with some caveats.
This was mentioned on www.woodenboat.com forums:
The upshot is that epoxy bond strength weakens dramatically with exposure to heat or (maybe?) saltwater or UV light. Additionally, epoxy's bond is not as fatigue resistant as wood. So using it as a structural bond is questionable. Using it in hot (120F+) environments is questionable. Using it in saltwater environments is questionable.
Since boats sit in the sun, tend to flex, and are often exposed to saltwater, how can we possibly use epoxies in long term situations.
I had to search hard to find any info on Resorcinol, but it's cheaper, supposedly lasts longer. But, as far as I can tell, it's really hard to find.