Subject : Unibond 800 as general purpose assembly glue Posted : 2020-10-21 8:20 AM Post #37958
Lately, in addition to veneer work, I've been using Unibond 800 for complex glue ups. I mostly really like the extended working time, but also the relative ease of sliding joints together (that haven't swelled from water based glue). The one issue I've noted is that it is rather thin, and can drip out of vertically oriented joints fairly quickly. Is there a good way to thicken the glue, without reducing it's strength? Would Unibond blocker be good for this purpose? Or what about fillers typically used for epoxy, such as talc, or West Systems 403 or 404 fillers? Thanks for any advice on this, and/or I'm interested in hearing your experience on using Unibond 800 as an assembly glue.
Subject : RE: Unibond 800 as general purpose assembly glue Posted : 2020-10-21 2:42 PM Post #37959 - In reply to #37958
Unibond 800 can definitely be used as a general assembly glue and its extended open time can be very useful on items like a mortise and tenon door, not to mention it has some limited gap filling ability as well. As far as thickening it goes, yes, it can be done but not with the thickeners designed for epoxy. For Unibond 800 you would use either shell flour or wood flour. Around 5% by weight and never more than 10%. I would not recommend thickening Unibond 800 for veneer work but it can be done for joint work. Remember, as you thicken the glue you reduce its ability to “wet out”/penetrate the gluing surface. This does not matter with epoxy because its a structural bond glue and does not require the penetration that other wood glues do.