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that's probably a good thing.
something i've noticed when seam sealing w/ silicon diluted w/ white gas was that it began to thicken before i finished the tarp.
some thing that didn't evaporate as...

might be ok as long as it still gives you enough working time to remove the excess before it dries... & as long as you have great ventilation.

good test. it would be great if you could come up w/ some kind of double roller, about 6' wide to run it through or pull it through & squeeze the excess away.