I had a old box of D&D Aquascape Putty and it was hard and old, had been sitting on a shelf for years and gave me a original bad experience. I then went to Waterweld.
I gave it a second try and it is way better than Water Weld, which has been hit or miss lately as Waterweld mixture has been crusty lately and it never really hardens.
The D&D is purple and looks like Coralin, holds much better, and does not mess with my Skimmer as much.
My New Favorite and I buy it by the case. A little Superglue on each side of a ball and then smash it together and mold it how you want, this stuff disapeers in the color of your reef much quicker than Waterweld and it is Solid like a rock within a few days.
I also Like The new Maxpect Glue Gun and refills for Superglue, a lighter unplugs the steel tip and I have much less waste. Highly Recommend! You Can also use it to glue under water if you have something large you are trying to get to stick.