When we are building balsa planes, we use several types of glue. But there are some places where we would like to use a glue like Sigment, or the old Ambroid. I have found some glues now available that are of a similar type. They include UHU HART, Duco Cement, and VPS Am-Droid. (UHU has several varieties, so make sure to get the HART version.) The Duco and UHU are available on Amazon. The Am-Droid is made by Volare Products.
https://volare-products.myshopify.com/products/vps-am-droid-cement
Dave
My limited experience is that Duco, SIGMENT, and UHU-Hart are pretty close to interchangable, Duco and UHU-Hart are as close to identical as they can be . SIGMENT is nearly the same with a slight amber tint. It wouldn't surprise me to find that all of them came from the same source and are packaged for the OEMs. Ambroid is much thinner and has a distinctly different smell, probably the extra toluene, and more orange than amber. It makes sense because Ambroid was originally a finish that was intended to be brushed on the bottom of canoes, so you both need it thin enough to brush and have enough color to put it on evenly.
SIGMENT, etc, tend to sit on the surface and not penetrate. Ambroid tends to run everywhere but soaks in more, sometimes leaving the joint starved. Either problem is solved by double-gluing.
I haven't tried the alternate Ambroid, because I have very abundant supplies of all of the others, at the current rate, about 400 years worth. And, despite some naysayers, I also have mostly-used 30+ year-old tubes that are still good and haven't evaporated to amber dust!
Brett
p.s. I always carry a small tube of Duco or UHU-Hart in my toolbox, because it works great for quick field repairs since it will stick almost equally to anything (metal, wood, most plastic) and the tubes are small. At the SWR a few years ago, I did the pull test and I found the wrap on my lines was starting to come unravelled. Twisted it back together, smeared on some Duco cement. In the desert, it was sticky enough in about 10 minutes to hold, off the the circle!