Originally Posted by
acuRAS82
1) Not sure about second coat, will let someone else answer.
2) The Booster is thinner. Some claim it’s hard to tell if it’s even adding value, it’s so thin. I myself can see an increase in glassy shine when applying it, but have no clue if it has any real longevity or not. The SiO2 Spray is much more substantial, way better as a standalone, can last weeks for some or months for others by itself. I believe this has a lot more sealant polymers than the Booster.
3) Pick one and go for it, don’t buy a gallon of each like I did. The SiO2 Spray is more popular and will probably alter the look and characteristics of your coating more while adding some decent protection, and I would think using it every 1-2 months max would be fine.
If you prefer your coating characteristics and look and only want a slight shine refresh without adding much durability/protection, I would recommend the Booster and you can use it probably as often as you want is my guess.