Pat - I'm reading between the lines here. But re my earlier posting about pva depositing a layer in the tube. If your looking for an adhesive, the "waterproof" type like resinW in the blue bottle(I think) are catalysed so they will glue non-porous to porous surfaces(I use it for non- to non-). These will tend to give the build up that concerned me. However the other type, where your warned not to use them in damp situations, probably wont do this. At least much more slowly I'd guess.
If you are only using it as a barrier as in silk painting or glass painting, I'd guess the commercial products like Pebeo are thicker, but not catalysed.
I'd be inclined to leave samples in short lengths of whatever tubing you might use for a while and see what happens.
John
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