I have used something like it. Worked ok for my trail rig, but you have to install some special valve cores so the crap does not blow out I guess. And if you go need to get them rebalanced down the road and they don't have the stuff.. they you have to demount the tire and remove it. Go with weights much easier for you.
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Cheaper than what? Lead weights? You might wanna make sure....last time I tried that magic stuff it was 8 bucks a bag and its only good for 6-8oz....and most of your bigger tires are gonna take more than that
Just have the tire jockey use stick-on weights applied to the inside part of the wheel where they are out of the way of trail damage and probably won't even show. Centrifugal force will keep them stuck in place and you won't be able to knock them off on the trail. I have been balancing all my tires up to 35" that way for years and that method has been problem-free.
Sorry for the Camaro wheel picture but I couldn't find a better picture showing the weights and how they are stuck onto the inside part of the wheel.
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