Crosslinking PVA's - These are the newest PVA's on the market and were formulated to overcome the biggest objection to normal PVA's which is their poor moisture resistance. Crosslinking glues pass industrial standards for water resistance and can be used on outdoor furniture and projects that come into contact with a lot of water vapour - like kitchen cabinets. They handle very much like the normal yellow PVA's with the only difference being that they are slightly thicker and a different colour.
I've mixed leftover bottles before.:dontknow: no problems so far. :gar-La; whatcha end up with is tightbond 1 1/2 instead of I or II !!!:rotflm: go fer it! It'll taste like chickin.:gar-La;
Yes, it should be OK to mix Titebond and Titebond II. I've seen commercial formulations in the past that used a mixture of conventional and X-link PVA.
Titebond III with any other PVA might give stability problems if mixed then stored for a while.
I bought a Glu-Bot. Great little glue bottle. So I fill it with red cap. Buy a gallon of glue while on sale. Ok.....now glu-bot is getting low. Pull out new gallon and it is blue top. Dohhhh!!