Things to rememember.
Most HVLP guns use more air than most 110 volt compressors
can deliver. But conventional guns use a lot less and do fine.
The CFM rating to watch for on a compressor is the 90 psi one.
Compressors are always compressing against the tank which is
90 psi or higher. They seldom see 40 psi to pump against.
Tank size won't help much. once it starts running, it
will keep running till full. Only CFM output
can allow it to catch up and stop.
It must be more than you're useing to stop.
It'll take loger to come on with a larger tank
but it'll also take longer to refill.
You want it to run as little as possible, the longer it runs,
the hotter it gets, which gives you moisture problems.
So the bigger the better.
Never compare compressors by HP. CFM is the true indicator.
Mfg's stretch the HP numbers, if you want to know the true
power, compare the amp rating of the motor.
That's the true power of the compressor and it
can vary greatly by brand. But the CFM to Amp ratio
holds pretty consistant from brand to brand.
You usually get what you pay for.
If you use HVLP you really need bigger fittings more than
you need a bigger hose. The std 1/4" air fittings really
restrict the air CFM's.
The female quick disconnect fittings narrow down to a
hole smaller than 1/8" dia. That's the bottleneck.
Home Depot sells 3/8" fittings that connect to std
1/4" air hose, the quick disconnect hole is twice as big.
Otherwise you need to run over 60 psi to the gun and
regulate down there to get enough CFM through the
disconnects to the gun.