I can understand your concern, and my response wasn't to imply that one shouldn't utilize PPE when applying coatings. However, I'd be more concerned about inhaling the petroleum distillates and the kerosene that solubilize the silica crystals before I'd be concerned about inhaling the silica crystals themselves. Silicosis -- acute or chronic -- really is a condition that is infrequent and unique to a certain subset of individuals that develops when exposed to high concentrations of respirable silica. These are people who work in mines, work in the fracking industry, sandblasters, foundary workers and masons. These are people who absolutely need to wear PPE and have rotational exposure to this "dust" that is suspended and inhaled.
When you leave a bottle of a silica coating out, the hydrocarbons, which are volatile, leave behind the crystals and you can inhale the hydrocarbons, which can lead to dizziness, palpitations, neurological deficits and nausea/vomiting. Therefore, applying silica coatings in a well-ventilated area or with a respirator is advised, but not because of the silica.
If you check out the MSDS for CS and CQuartz, you'll notice that often the respiratory complications or exposures aren't classified, and that generally means they fall below the calculated risks or data is not definitive.
Knowing the the higher airborne concentrations of silica required to cause acute and chronic silicosis are immensely out of proportion to that during the typical coating application, I highly doubt doing a rinseless wash or QD with some silica-based lubricant in it is of any concern.
Frankly, I'd be more concerned about grinding down the paint with Gyeon Primer or CarPro Essence and getting that powder airborne than I would with any hand applied coating or spray coating.
Thanks for the explanation. I am always on the lookout for silica exposure because I am actually a mason
I'm not a big fan of Opti Clean personally. Streaks and smells.
Opti-clean worked fantastically well for me as waterless. Used it in my garage and the perfumey smell was overwhelming. Really wish they'd fix scent, or tone it down. Except for that it could be my go-to.
Originally Posted by pheerix
I'm also quite picky about smells. Worried I won't like Ech2O's smell either.
Not overpowering at all. I hate stinky stuff and had no issue with Ech2O.