Exterior silicone

I have to seal a leak at the fitting between two pipes in my dump system plumbing.  Do you guys recommend the Geocel Pro RV stuff, instead of silicone, for something like this?

Typically that would be ABS cement.

Typically that would be ABS cement.

Thanks Don!  I just read a technique that said you can heat the joint and it would "suck" ABS cement into the joint, much like sweating copper pipe.  I don't think I could separate the joint and reglue, so I'm going to try this and for good measure, add a coat of JB Weld PlasticWeld Putty.  Sorry for hijacking the OP's thread!

Don't know about the heat, but ABS cement is thick enough that you should be able to just brush it on.   And correct, you can't separate them once glued.

I have to seal a leak at the fitting between two pipes in my dump system plumbing.  Do you guys recommend the Geocel Pro RV stuff, instead of silicone, for something like this?

This
https://www.plast-aid.com/pages/plast-aid-101

Mix and wait until it starts becoming not too drippy, then apply all around the joint using the popsicle stick or cut down q-tip sticks. Keep reapplying until it builds up a thick bead  that covers the entire joint, then  use your finger to level and smooth  it out. It doesn’t stick to skin.

The advantage of plast-aid over abs cement or pvc hot glue is that it can be applied to an assembled joint.  JB Weld is just epoxy.