what is s.a.

i read in the archives about adding s.a. to resin. What is it and what is it’s purpous. thanks

…So when you approach another Vato in your hood you can say,“what’s up S.A.?”. …Naw,it’s “surfacing agent”,you add it to laminating resin to make sandable resin.Herb

thanks Herb. you would think after a three hundred boards you would know what s.a. is. huh? oh well, ask a dumb question…thanks again