Just ordered some Gloop to try it out. I have used Weldon 4, which is very similar. Worked well on natural PLA from MatterHackers. I felt like it made a stronger bond than CA. I also tried it on MatterHackers Tough Pro PLA. It did not seem to bond this as well as standard PLA. Pretty unpleasant to work with as it requires respirator and gloves.
When I get the Gloop, I can give you a comparison.