1st 3 patchings failed trying 2 dif brands glue, varying cure times tween coats, 80 grit emery cloth, pressure with ice cream scoop, in shop 80f 30-35 humidity. 4th attempt, NO LEAKAGE SO FAR; only 2 thin coats, 30 min then 45 min cure intervals with hard pressure 10 lb barbell plate rolling...