Dolphin Glaze is a catylised filler.
I have used Easy lite (sic) amongst other fillers. I use fantastic now, which is basically the same as easy lite in consistency and use, but is available in a bag rather than a tin. This keeps it fresh as a daisy, handy for model use where you use smalller quantities over a longer period of time.
However no matter how carefully I apply it, I always end up with a few areas that need a very tiny amount of stopper afterwards. Perhaps in the automotive trade the thick filler primers do a good job of filling those areas in, but with thinner paints used for models, the defects show up.
Therefore I like to use a second product to correct those areas. Dolphin glaze is okay, but tends to be harder to sand than is ideal for a correction putty. Really what I'm after is a two part equivalent of the 3m acryl red.
Having said that acryl red works pretty well for very fine filling, and a tube lasts a very long time.