Theres one in Montclair and one in Sanbernardino. There may be more. lets see if I can find a link for you. Cant find web site but heres #s for the two I know of. The acrylic cement comes in #4 and #16 one is thicker than the other. Tell the guys there what your doing and they will recommend what will work best. I made some HUGE CPR overflow boxes a while back and they were very helpful. What part of town are you in? Maybe someone will chime in more local to you if your far.
S & W Plastics
5158 Holt Blvd
Montclair, CA 91763
909) 621-4887
S & W Plastics
1936 S E St
San Bernardino, CA , 92408-2713
Phone: 909-824-9643
FAX: 909-824-0317