High quality acetone is best. Perhaps rather than spraying, if it's for your own use just make a small amount of blend at a time. I usually do the following:
1. Dissolve noid in acetone in a small glass/metal bowl (actually use an old snus tin)
2. Add appropriate amount of solid matter of choice (usually a couple of grams)
3. Add a bit more acetone if need be so there's a little solvent sloshing around (i.e., solid matter is saturated)
4. Mix around and squash matter whilst allowing acetone to evaporate
5. Once it starts to look 'drier', allow to sit for a few mins then mix again
6. Repeat 5 until acetone appears to be gone.
7. Allow to air dry to ensure acetone is gone turning the blend over to expose to air.
I use tobacco as the base, a small glass bowl to work with, and a metal spatula to mix. No need to bother spraying blah blah. Works great, as I know roughly the amount of tobacco-noid to add to a normal rollie (~100mg). You can adjust the amount of noid to vary strength - as a lightweight, I usually go for 50mg UR144 in 2 gram tobacco. This gives around 2.5mg of noid per 100mg.
Thanks for the helpful reply. Roughly how many ml of acetone would you ude for your 50 mg of ur144 in 2 gram of tobacco ? my first efforts were on the light-weight side too, used about 460 mg of ur144 to a total of 25 g of damiana and mullein. (Just to clarify this is strictly for my own use, although it might seems like a lrage quantity i have no itention of dealing, i was basically just halving the doses the guy used on the you tube clip for the sake of simplicity, + no harm in having plenty of entirely legal componds in storage for a rainy day. When i get better at calculating doses i will probaly end up doing the same as yourself Mela, and just make 1 or 2 g of blend at a time.
I had to use more than 2ml acetone in the end as it just dint go far enough. I then added a coupleof handfuls of fresh damiana and mullein to the tray, and mixed and mixed for ages to hopefully ensure i ended up wityh a blend on the mild side. Im a lightweight too and am m not too keen on those premade blends where you take a pinch, throw half of it straight back into the container and just collect a fewspecs of the blends's stallks/leaves etc and add tehm to your joint (just 5 or 6 specks for me - i guess i really am i lightweight, unless that stuff really is extremely potent, or maybe i got a real hot spot in my order.
I think that pre made belnd i bough contained am2201 and had something else too,which may have been am694. I find that blend makes me prone to 'out of control thought; paranoia, anxiety, the whole works of ehat you dont want basically. So I havent been using it much. NEVER touch it without preloading on etizolams, which certainly helps a lot .
By luck raher than judgement the strength of my first attempt at a home made blend seems to have turned out just about right for my tastes. One single skinner and im wasted (i should stick to half a J, but im a greedy drug pig.

), but no anxiety attacks, which is what one would hope for from weed.. Stll taking etiz before hand though trying to cut back on them.
I have also repeated the same process for a mamm2201 blend. Gonna try a bit of that on its own soon, when im sure all the acetone's gone, i believe i can still smell it, even though it's had a good 3 days now sitting on a baking tray in the open air,...Then after that, im gonna mix an equal amount of my MAM blend with my UR blend in a container, mix the fuck out of it, maybe even blend the fuck out of to ensure an even mix. Looking forward to sampling both of these.
I must say i much prefer this newer range of 'noids, they seem to be much lower risk for inducing th panic, anxiety and paranoia to which i was badly prone on the older noids and real skunk etc. So far UR144 doesnt seem to be causing any worrying 'loosing control of thoughts', racing thoughts, anxiety or paranoia. Jusut a pleasently wasted feelng. %)
It's looking like im going to be going back formore, I really want to be getting this etizolm thing under more control first though. I;ve already started tapering down on the amount of etizolams consumed before a ur144 session. Quite a way to go yet though.