Too cool -- I played with the stuff on some spinnaker cloth (which is very lightweight nylon), but had no luck there. I'll have to get out some natural fabrics and resume the experiment.

BTW, water-based polyurethane can be colored with the tints they use for latex paints. I got somebody [don't want to get anyone in trouble for doing the impossible]... got somebody to supply me with some tinting colors from the store where I bought the Polyurethane. They were told by the department manager that those colors couldn't be mixed with the stuff and instructed not to mix it for me, but they did manage to liberate a film can of each of a couple of colors for me and it seemed to mix just fine at my house.

PS -- if anybody can give me pointers on getting a good finish with fabric that won't shrink for me, I'd sure love to hear 'em. Spinnaker cloth is beautiful and amazingly light stuff that comes in a bunch of vibrant colors with its weave already sealed... I just haven't been able to get it to cover an open framework without sagging.