Pin Hole Leak Black Water Tank

[loadmaster]

Found a small pin hole leak on the curved section of my black water tank. What are some of best options to repair. Called local dealer and he recommended a patch that was activated by UV light. I was thinking along the lines of a JB Weld plastic gas tank repair. Thanks

[Seann45]

Eternabond roof tape... clean the area then place the tape over it. Many forums recommend this

[TX_Arvee]

Also recommend eternabond.

[mike837go]

If the hole is small enough, drill and tap to 1/4-20 and install a pan-head nylon screw with some sealant on the threads.


It'll give you 10 years.

[Edd505]

Originally Posted by mike837go

If the hole is small enough, drill and tap to 1/4-20 and install a pan-head nylon screw with some sealant on the threads.


It'll give you 10 years.

or a self tap metal w/sealant

[mike837go]

Originally Posted by Edd505

or a self tap metal w/sealant

IF you can find genuine stainless. I wouldn't trust anything from Lowest or Home Despot.

In my opinion, Black Water is best dealt with ONCE! Do the job properly.

[DocBrown]

JB Waterweld. I've seen this stuff plug a small hole in a car radiator and last for years. I'd be inclined to try this first before drilling holes and making a bigger hole.

[loadmaster]

I first thought about taping a new hole but the hole I have now, is small, only a small drop forms every couple of minutes. Did not want to make a bigger one. I went with the JB Weld and so far so good. Waiting to see what happens with the cold weather Thanks

[norty1]

Covering the repair with Eternabond still may help it hold up over time.

[GrayHawk51]

I've used "Mighty Sealer" flexible rubber coating sealant. https://www.mightysealer.com/?mid=2830260. Costco sells at at times. I've had good results. That's my 2 cents......

[VicS1950]

Originally Posted by loadmaster

I first thought about tapping a new hole but the hole I have now, is small, only a small drop forms every couple of minutes. Did not want to make a bigger one. I went with the JB Weld and so far so good. Waiting to see what happens with the cold weather Thanks

The good news is that under normal service the tank isn't under pressure and there isn't enough depth to create much head pressure. A pinhole in poly tank material isn't likely to continue to fracture/travel so drilling stress stop holes probably wasn't necessary. A long(er) crack or a hard plastic tank would be a different situation.

I'll go with your choice on this. I've seen and had great success with JB Weld. Off the top of my head, JB Weld products have repaired a stripped out drain plug on an outboard motor gear case, an engine coolant system punctured aluminum casting (think pressure and heat), numerous other cracked aluminum parts, and many plastic parts. I've used JB Weld products to copy and remake actuator arms and similar parts.

FWIW. As long as the surfaces were properly prepped, your repair should be fine.

vic