There is no way they put 1.2g into 10ml... one third of what they claim, if you are lucky. Only reason they put it into a spray is to cheat you.
I recommend making your own nasal spray, I had been mostly using cocaine this way. You get much less nose irritation this way. But there is a catch, it is much easier to consume big doses during short time, and you can use it in public, without people knowing. Those might sound like good things to some, but any addict will tell you, they don't have to be.
I used the nasal spray to help me study, I took around 8 splashes a day, and it worked well for about 3 months, but than one day I took 2g in a day and it hasn't been the same since, can't stop at 8 splashes, so I had to stop all together. So just a warning, the addiction is mostly done by short strong dopamine peaks.
RECEPIE:
distilled water + 0.1g salt per 10ml, or saline solution meant for nose sprays (the salt significantly reduces irritation, don't forget it)
0.20 - 0.4g per 10ml (doesn't matter much, do it as you like)
clean everything you use, preferably in boiling water.
Eat, hydrate, sleep.
Normal coke should dissolve very well at this concentration, I came across some that would become saturated at roughly 0.05g per 10ml and wouldn't dissolve at higher concentrations, I wasn't able to confirm which cutting agent does this, so I didn't use the coke, advise you to do the same.