silicon lube

can i use silicon lube to join 4" plastic pushfit fittings together if not what can i use?

they don't need any kind of lube. they PUSH FIT.

spit on it.

this is the correct aplication for the job, but it actually welds the plastic together to make a watertight seal, so no fittings can be adjusted ar salvaged later.
there is absolutely no air leak so no worry about smells.
it dries in 10 minutes and i mean a solid fixture.
it is the dogs bollocks.

http://www.screwfix.com/p/evo-stik-pipe-weld-250ml/82210?_requestid=554885