etching primer

I was told by my paint store ...and read on the i'net that etching primer is old school...what folks are using now is epoxy primer...

...for paint to really adhere to it , it has to be sprayed within 24 hours.

I agree with Rob, if you are doing small amounts, why don't you use, a rattle can primer ? I did that until I was ready to do a paint spray and primed again with epoxy primer..

Grassy