Eastwood epoxy primer

I have noticed there is a lot of difference in Epoxy primers, some sand good at right time, others not so much. My opinion is expoxy primer is meant to give a good surface, specially on bare metal, for further work, as in a high build primer, then on ward. Let me say this, always look up the tech sheet on what you are using. It will tell everything.
I love SPI epoxy but when you read the sheet there are a lot of dos and don't and they can all it you in the ***!! if you don't know
Surely Eastwood has available a tech sheet for their epoxy. Eastwood sells good product but they buy the stuff from someone.