Sounds like a good plan, better to look at a bit of crazing and know ur tank is solid than worry of wet floors one day.So do a line, wait for five hours and doing another line is acceptable? The tank is in the shade of the house, so it probably won't get outrageously hot. But I've already seen that rushing it makes for bad crazing... I'm pretty pissed the worst was in the front viewing panel bottom edge.