as for premixing the NAOH with water, the first time i made it i tried doing that. it did not work at all. i don't see how it would work, because it seems the NAOH reacts with the water instead of reacting with all three ingrediants at once. once you add the NAOH to water it dissolves and heats it up, seems like this would fuck up it's reaction with GBL. I suppose it could work, but it is absolutely unecessary. the reaction is not driven by an outside heat source-i'm assuming you mean an oven. have you ever made it any other way, such as the way erowid or lycaeum describes. if you make it that way, than you would realize it's not a coincidence that the reaction the three have when combined cause it to literally boil itself with no outside source.
and i wouldn't say it is a wild approximation to weigh the NAOH, true it can suck moisture from the air, but unless you leave it sitting in open air it doesn't do it.
do you knowanything about red devil lye, it certainly isn't anything close to drano.
and yes, i believe years of experience and consumption make me qualified enough to comment on this. and if you don't believe me, check out some legit websites. they all have the same instructions. coincidence?
peace, outkast