Replies

1. 
   _mj_ | Jul 14, 2022 05:48am | #1

   Unibond 800 has normal temperature parameters. I have used it many times, no blankie required. I looked at the story, his failure resulted from leaving glueups in an unheated shop overnight. Not really a fair tale to tell in a rewiew article as it was his fault for being outside the lines. I doubt he "always" uses the blanket in summertime.

   Something worth mentioning is the availability of light and dark hardener powders for gluelines that can pretty much vanish on bent laminations.

   I have never used Unibond 1.

1. 
   mwalsh3 | Jul 14, 2022 01:28pm | #2

   I've used (only) Unibond 800 for bent laminations and had very good luck with it. The long open time and rigidity are great for this application. My shop is not heated but in the basement of my house - temp is around 65-75 year round. Have also used Unibond 1 for some situations where I needed more open time than other PVA glues and it also worked fine. The Vacupress website indicates that 1 is ok for laminating/veneering but not as "high a performer" as 800

2. 
   mattk41 | Jul 14, 2022 02:47pm | #3

   I have used both Unibond 1 and 800: they are really for very different applications. The U-1 isn't really meant for bent laminations of funiture parts...like legs or case parts...this is where 800 really excels. 800 has a great open-time and dries super hard without any creep (it won't retract as it dries) and is a bit gap-filling. Perfect for making structural parts where you will need to cut the joinery after the glue up. Unibond 1 has some similar qualities (nice open time, dries without much glue line or creep), but is really meant for cold veneering. Its special quality is that is doesn't bleed through the pores of thin veneer. I suppose if you were laying up a curved drawer face --not too large a glue-up, not really structural and the face veneer was critical--you might opt for the Unibond 1? Check the site of Vaccupress.com! Daryl Kiel (proprietor) is the maker of products and the web site is loaded with info.

3. 
   pantalones868 | Jul 14, 2022 03:12pm | #4

   PVA glue tends to creep in high stress bent lamination. Unibond 800 works very well for high stressed lamination. Unibond 1 may be effective for veneer applications over curved areas but it's still pva and any bending you can do like wrapping a piece of veneer with just your hands is not highly stressed . Clamping a stack of material that may be 1/4" or more that's stress! I've had trouble with practically every type of glue if the temperature gets too low. I've also used plastic resin glue for bent lamination and they say that it has to stay at 70 degrees or more and they mean it!
   I make up a heat tent with a moving blanket(s) and a small heater I have because to keep my shop over 65 degrees in the winter can be difficult and costly. I find 60 degrees to be a very comfortable temperature for myself working. So the work is hot but I'm not. I usually save my glue ups for night because it's quiet and I can work really late so that method gets used often for all types of glue ups. I don't see how this is user unfriendly.

4. 
   user-2344540 | Jul 18, 2022 09:30pm | #5

   Thank you all for your information. Unibond 800 it is. I live at 5000ft. In the summertime it's over 100°F and in the wintertime it's under 25°F. I'll adjust my process accordingly.