you are right...in my feeble mind I was confusing mastice gutta with tubasti (plumbing today, sewer fumes must be destroying brain cells). As it turns out, I was not right about what mastice gutta means either. Nor even what language it is in. Attached is a picture of the kinds of glue that I currently have in the garage. The Tubasti in that tube is red, I'm pretty sure, but it is nasty stuff. All of the other ones seem to work fine. I have been using the hutchinson lately and it is pretty good...