Originally Posted by bribo12
It's all good. Thanks I'll probably just drill it first and get the bulkhead on there then paint it.
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no, then you have to deal with overspray inside the tank/bulkhead and could cause problems with clogging the threads or prevent PVC
glue from getting a complete bond on the bulkhead.
Cut out a circle of paper or masking tape about 1/8" bigger than the bulkhead fittings, affix in place, paint, remove, you will have a clean circle of glass to drill and the overlap will ensure a good seal and no overspray.