Weld-On 3 or 4 would work but it needs to dry for 24 hours. The Weld-On 16 would work as well, a little thicker kinda like a silicone, but again needs 24 hours to setup. Don't know of any acrylic cement that drys ready for use quickly. You might try a CA Glue, two part super glue (glue and activator) as it drys within seconds and will hold acrylic. You should be able to get the CA glue at most hobby shops.