X2, thats exactly how I do it. Id bet its just sand in the bead.stick the tires under water and see were there leaking!! i stuck mine in my pool and found my leak,, i just needed to break down mine an clean the rim .
Are you positive they leak through the seams? Or just guessing? I would hold them under water first, adding slime to those tires defeats the purpose of having them.It seems mine is leading through the threads as they are new but super thin double buffs. I think a little Slime will help stop the bleed through air leakage. Thanks guys.