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unibond vs. PPR2/10
i recently purchased a 5 gallon container of unibond ... and that got me thinking, why am i using unibond instead of PPR? PPR is powder, mixed with water. unibond is a heavy 5 gallon pail of liquid resin, mixed with the powder catalyst. why am i paying shipping to ship liquid across the country when i can use lightweight powder and my own water?
what do you all use for urea resin glues? thanks for the advice and guidance.
I also hate a) shipping water and b) standing around stirring powdered glue. Solution: UltraCAT PPR plus a Kitchenaid mixer with a whisk (craigslist score for $20). Weigh the powder, dump the water, turn it on, scrape the bowl sides a minute in, bam, lump free glue.
We used literally thousands of gallons of Unibond before we bought our hot press; UB isn't really designed for those kinds of temps so we use National Casein 750 now, mostly, though still use some UB for vac press stuff. Here's my $.02:
A lot of it comes down to application and preference. The downsides of PPR (and it's all the same stuff, regardless of whom you buy it from) are: shelf life, mixing, and consistency. I always found PPR -- even fresh material -- grainy and a PITA to mix. When spread thin on a panel for veneering it often seemed to pull or fisheye in a way that UB does not. Being able to vary catalyst ratio to achieve different cure times was a good feature for Unibond, and achievable cure time is faster than with PPR. I also like the different colored catalysts available for Unibond, but that's not essential.
Downsides for Unibond are smell/fumes (though that's much better since the reformulation) and, of course, cost. I've never minded paying a premium for a very reliable product, but that is a personal decision. I believe we were one of the biggest users of Unibond and we never had a failure due to the adhesive. Not ever. How much is that worth?
As they say in the car commercials and online fora, YMMV!
I personally do not like the idea of soaking my wood with water (water based glue)and then hoping it all evaporates back out again. Unibond solves that problem and I have no issues (cupping, warping etc) related to the presence of water. My two pesos.