So glad you are excited and coming to the SFPAF. I don't know which artists might be working in acrylics, so I hope someone will offer a response.
Please review the Prospectus for your question regarding the size limitations for the works you submit for judging and hanging in the gallery. You can also sign into the PAPNM website and view the works from 2015 under Past Exhibitions I believe.
The gallery edge wrapped paintings have never been submitted to date and since it was not an exclusion noted in the Prospectus, you are welcome to submit your works that way.
There is a local art store, Artisan, which has a decent selection, but the prices are retail prices. I might suggest you send your supplies ahead of time to where you will be staying so you are guaranteed you have what you need and won't need to make any compromises.
I hope this helps! See you in June, Deb Stup, SFPAF Co-chair