Thanks for everyone's input!
JBurton I guess somewhere between sandy and stucco.
Someone else just made a post about how to apply stucco on aluminum & I replied to him and thought... "duh, I need to respond to the people who tried to help me
and let them know what I ended up doing"
Val47 Here's your update
My Sherwin Williams rep told me to use their "Extreme Bond Primer" primer, apply Quikrete stucco and paint it, that was a huge nope!
I'm sure it was something I did, I had to thin it out a lot get it to the right texture, the next day the Quikrete was dry, crumbly & came right off.
So I scrubbed it down to the primer, went and got sand that is made to add to paint & added it to the Sherwin Williams top coat paint (put in more than suggested, a bag into 1/2 gallon), applied the paint pretty thickly and used a rubber float and "stamped" the whole sheet. It turned out great ,was very easy & the bond is solid (picture below).
I really recommend that extreme bond primer, I scrubbed the hell out of that panel to get that grit off & it didn't scratch at all.