I think you've got the brand of polyurethane called Varathane (now manufactured by Rustoleum instead of Flecto), and you have the water-based indoor version of it. If you have the gloss version of that as well, you have the clear finish that's preferred by most experienced polymer clayers (..others can be used but won't be as tough, or are the same thing but much more expensive like "Studio by Sculpey" Glaze which is not the same as the inferior "Sculpey Glaze"). You can use clear finishes (including polyurethanes) in various ways on polymer clay.
They can be brushed on, or dipped into the finish (usually decanted into a small jar/etc), and they can even be applied by hand (though not usually) or put into certain kinds of sprayers. Check out this page at my site for loads of details about using Varathane, etc, with polymer clay, including dipping it when you want to do that, using specific kinds of brushes, etc: http://glassattic.com/polymer/finishes.h... (...check out the whole "Varathane" category**...and a lot of the "Future" category will apply too though it's a much thinner type of clear finish than polyurethane ...you could also check out the "Crackling" category if you're interested in that effect) ack! --just noticed that the subcategory called "Other Uses" under Varathane must have a misformed anchor link and I can't fix it for awhile, but you can always just scroll down to it if you want ADDED LATER: Looks like there may in fact be a different Varathane that's new and a bit different from the one I discussed above.
Almost any water-based polyurethane is fine though, but let me try to scrutinize the differences and BE RIGHT BACK. Okay I'm back, and looks like they probably just have new labels now for some of their polyurethanes. (Rustoleum bought out the Flecto company a few years ago and may just now be getting around to doing more with the labels to *emphasize* certain properties, etc).
I don't even see the older label at the Rustoleum site any more, and do see the "Heavy Use" one that seems to be the same, so it's probably just been relabeled. This is the label I'm familiar with for Rustoleum's Varathane, indoor, Gloss (this page shows their Semi-Gloss and Matte versions too): http://polyclay.com/varathane.htm And here is a pic of the label on the "heavy use" one (probably the one you have): http://www.unifireusa.com/retail1/item.p...
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