Painted Tank and Bulkhead Seals

Ecotech Marine

NotoriousENG

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This might be a dumb question but I'm having a hard time finding an answer. I just drilled my tank and am planning to paint the background and was wondering if I need to tape the area around the drilled holes off before painting so the seals will be in direct contact with the class? Or is it fine to have paint under the bulk head seals?
 
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JumboShrimp

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I agree that 100% contact with the glass is best. Recently I ‘broke the rule’ and had uneven paint layers right up to the hole; even though I cranked the bulkheads tight, water dripped down from behind the overflow and I had to remove it and sand down the paint. It was a pain. Best wishes!
 
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NotoriousENG

NotoriousENG

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Also, some bulkhead gaskets come with injection molding cast marks on one side and smooth on the other.
Smooth side should be on the glass IME it seals more reliably.
The eclipse came with three bulkhead seals, what would be the proper way to orient the smooths side? I figure smooth side towards the class on the inside of the tank. The smooth side towards the glass on the outside of the tank between the overflow box and outside glass. Lastly, smooth side touching the inside acrylic for the last seal in the external box.
 
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NotoriousENG

NotoriousENG

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Am I missing something? You’re painting the outside of the tank right? The rubber gaskets on the bulkheads go on the inside of the tank
I'm the one missing something, I didn't know regular bulkheads only have seals on one side. Thank you for pointing this out since my return is drilled for a standard bulkhead. I'm new to sumps so this all new to me
 

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If you’re just using the bulkheads for return lines, you just need to put the gasket on the flange side on the inside of the tank.

However, if you’re installing an external overflow box, you will need gaskets between the tank and the exterior overflow drain box. Tape off where the gaskets contact the glass prIor to painting for a proper seal.

Here is my tape job for the gaskets prior to painting after, I drilled my tank…

CA4455AF-D53E-46EF-AE63-EECFC13642B3.jpeg
 

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