solidying latex

[tv2q0]

Hi everybody, i need a cheaper replace for silicone rubber so i guess latex is the right choice, but, vinegar makes it solidify very fast and there´s no time to cast into a mold and it solidify in a very irregular way as a chewing gum, so what can i add to latex to it solidify in a uniform way and in a time controlled way? (that its structure will be uniform when solidify, and lets to cast it into a mold before it solidifies)

(sorry if my english isn´t good, i´m not english native)