What sprayfoam to use to fill 2-1/2 gallon jug floats?

[Harford Crabber]

Anybody used Great Stuff to fill plastic jugs?  I want to waterproof them in case of puncture.  Since this stuff expands I'm concerned it might bust out the side of the jug rather than expanding out the top hole.  Anybody used this or another product that worked?

[reds]

Anybody used Great Stuff to fill plastic jugs?  I want to waterproof them in case of puncture.  Since this stuff expands I'm concerned it might bust out the side of the jug rather than expanding out the top hole.  Anybody used this or another product that worked?

The good stuff that won't absorb water is called close cell foam. Great stuff is open cell and will absorb water.

[reds]

Anybody used Great Stuff to fill plastic jugs?  I want to waterproof them in case of puncture.  Since this stuff expands I'm concerned it might bust out the side of the jug rather than expanding out the top hole.  Anybody used this or another product that worked?

The good stuff that won't absorb water is called close cell foam. Great stuff is open cell and will absorb water.

[Harford Crabber]

Thanks  Reds.  I would have bought the wrong stuff.  Home Depot has the "closed cell" foam. I'm gonna pick up a can and I'll let y'all know if it works.

 Loctite "Tite Foam"  $10 per can.  

[discover]

I used foam filler to fill my laundry detergent bottles floats so that they stay ridged and float better and it is working out great as the bottles don't crush anymore. I do suggest fill the jugs a little at a time to allow for the foam to expand and harden and then fill the rest of the bottles as needed. I didn't use the closed cell foam as I didn't pay attention to the type of filler I was using, but if my laundry bottles break now, then I have a bigger issue. LOL.

[Mr. Ray III]

You also don't need to fill the space entirely if you're trying to keep it floating in case of a hole, so I wouldn't worry too much about putting the most in you can get.

[Harford Crabber]

I ended up using one can of the loctite tite foam "big gaps" like the red can above.   I was surprised at how slow it comes out of the can/nozzle tube.  Several minutes to fill 1/2 jug then moved on to second jug.  2nd jug filled about 1/4 full and ran out of foam after about 15 minutes. I sprayed a mist of water into each jug, as per directions on the can. It expanded much faster after spraying with mist of water.  The jug that was 1/2 full expanded to where foam was coming out the top about 24 hours later.  The other 2nd jug didn't expand even to half full. I had some old leftover foam pipe wrap that I cut up and finished stuffing in the second jug.    

If I were to do another set of jugs (Keep your mind on crabbing!!) I would put about 2" in each jug and mist it with water and let it set overnight to expand and harden. Then repeat that process every 24 or so hours, until foam has expanded out the top.  
The spray nozzle that comes with can appears to be a hollow plastic trigger with clear plastic tube.   Would definitely need to clean out the spray nozzle with water after each use otherwise foam hardens up in the tube and it's not easy to get the foam out.   Spray nozzle/trigger is removable from the can.