SO I need to do some minor acrylic repairs on a lobster tank using acrylic cement. I'm hoping to do the work and fill it back up within a couple hours. Weld-on 16 says 24-48 hour cure time. But I'm concerned about leaving the system down that long and losing the biological. I can't find a cure time for Weld-on 4. I'm assuming it's faster but how much faster? Anyone have experience getting weld-on joints wet soon after completing the work?