Is this enough compressor?

That's probably pretty good. Find out the requirements for something that takes a lot of air to run....like a paint gun or a sand blaster. If the CFM rating is less than that compressor at or close to that 90 PSI, it will do the job. That sounds like a right good rating though. I just cobbled me up a big compressor about two months ago. It has a Kellogg American 120 gallon horizontal tank, a Harbor Freight 2 cylinder single stage pump and a 5 HP 220 volt motor. Heck if I know what it's rated at now, BUT it runs my blasting cabinet and the compressor will pump up and cut OFF while I am blasting, so I know it produces more CFM than I am using. I also know that if it does that, it is plenty big enough to paint a car or do anything else. Remember, the size of the compressor tank has nothing to do with CFM. That is a function of the compressor pump and the pump speed. And speaking of pump speed, any good air compressor shop will tell you that it is best for your pump to have a pump speed around 750 RPM. Most store bought compressors spin the pumps much faster to compensate for a cheap or undersized pump. That's why you won't really get a "good" compressor until you get into the higher dollar amounts from "discount" stores. I have a smaller Husky 30 gallon compressor that I traded fixin a lawn mower for. It had a bad motor on it. I bought the cheapest chinese replacement I could find....BUT I also got a smaller pulley for it at the same time to get the pump speed down to about 750 RPM. That does two things. It gives the motor more leverage to spin the pump, reducing the load on the motor. It also makes the pump last longer cause it ain't spinnin its *** off. I use the little Husky for everything else but blastin or paintin....I haven't done any paintin yet, but I know the big compressor will do it. Moisture control is also another real important thing to consider. You need a GOOD moisture filter. I just make my own outta PVC. I run a tee in the line and drop a section of PVC down almost to the floor and put a plug in the bottom of it with a drain **** in it. The moisture will automatically drop into the trap and you can drain it out. You need to keep the compressor tank drained too. If you read up on them, compressors are simple beasts and are pretty easy to make yourself....you can save a lot of money and usually end up with better than what you can buy from a store.