Its sands very easy, just like the DC540.  You will fill your shop with white snow, make sure you wear a mask or you will probably get a headache.  But just like most primer/fillers it builds weight fast.  Only leave the bare minimum to get your white base, which you do need for yellow.

 Well, I've tried the stuff out. It's really thick out of the can, got a funky smell to it too. I thinned mine a lot, probably about 75/25 thinner/primer and sprayed it with my detail gun. It sprayed and covered well, but I don't feel that it sands as easily as the DC540. My feeling was that it's not as hard a finish as dope, but it's close. My opinion? I like the DC540 much better, too bad it doesn't come in white.

  Thanks Bill, that might be something to keep in mind. I'm fine with grey primer, except under yellow.

Primer weighs too much,

 I agree. The main reason I tried it here though was to achieve the white basecoat for the yellow. I was also curious about how the product worked. Figured it would be a toss-up weightwise between it and a good solid basecoat of white dope. I'll be back to my normal no primer routine next time.