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I tell you what, the tools are a great value. But the compressor will not keep up with a D /A sander. You might get away with the grinder and air chisel but you need at least i think 300 litre tank to match the air that a spraygun and d/a sander.
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A big tank on a small compressor does not help much. You can use a tool for longer before the compressor cuts in, but the compressor will then have to run for longer to refill the tank. That may in fact make the motor more likely to overheat.
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The flow rate is 14.5 l/m which is good though, and just as important as tank capacity.
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That's the
displacement, its air delivery is more like 5.2cfm (150l/m).
For spraying the tank size just needs to be big enough to smooth out pulses from the compressor. If it can't deliver enough air it can't deliver enough air!
One of the differences between cheap airtools and quality ones is their air consumption and the consumption ratings on many of the cheap ones are just lies.