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Before painting use a tack cloth to remove the dust. Be carefull during masking with greasy fingers that will give silicon in your paintjob ( small holes ). Tomorrow I will paint three colours. I use a Sata 1,2mm airgun. Filter the paint before use for small parts.
I bought a big charcoal filter in a weetshop and used a vacuumpomp to make a spraybooth filter. That works fine and clean. The walls are masked with plastic sheets. Use in the airline a waterfilter to remove water and oil from the compressor.