At the risk of sounding obvious, have you try spraying your tent with the water hose then checking the tent for leak(s)? If the constant pounding of water via water hose at close range don't sprung a leak, maybe you two would be fine during stormy mountain weather... Maybe.. I seam sealed my tarp tent without the dilution method and so far it has held up. But again, I haven't exactly been the worst weather imaginable..