do u mean "plastic" as in plastic or acrylic. if its jus ordinary plastic throw it out. but if u got an acrylic bong it can be easily repaired. if u dont really care how it looks jus so u got something to smoke from jus duct tape it as long as its not close to the bowl or anywhere it can heat up. if ur like me an u like ur smoking "utencils" to look halfway decent try the hot glue. it does work but it will melt if heated. also im not to sure on this one but rubber cement meight work, but before u use it squirt some on a piece of paper to dry. it has strong fumes so u wanna make sure they arent there anymore when it dries. also u should try elmers wood glue, if that shit can hold 4 pieces of wood together while i beat the hell out of it wit a lathe(or however u spell it) it should work pretty good wit some plastic bong that doesnt get too much pressure where u glue it.
i thing that hot glue would be ur best bet an if it keeps breaking, duct tape it, as long as it smokes fine theres no problem.
peace n bagz
electroshock, brainwave, hair rize,
look in this killers eyes,
static with me you only fantisize,
rub the wrong way, quick reflex,
eager to jump at fuckin anyone an put em in check,
i let things get to me now im tha one startin tha static,
easy come easy go problem solved wit automatics,
deep breaths takin,
no need not necisary cause tha static bein started,
does it scare me?, not at all