If your PLA prints leak like a sieve like mine did initially, look at my two posts here: 3D printing, how do you do it? - #60 by Flo - Builds - FOIL.zone (3D printing, how do you do it? - #104 by Flo - Builds - FOIL.zone)
I printed my ESC’s watercooler for today with those settings and glued it to aluminium stock. The test with an airpressure of 3 bars showed no signs of leakage. I can only recommend investing some time in a watertight print test, it easily pays pack in saved time for epoxy or paint coats.
If you are using Cura as Slicer for 3D printing here is my current watertight print profile for cura3.2.1