I use pactra occasionally & finding shops who stock it are getting fewer & fewer. Last lot I got through was from Hobbystores & they carry the full range of solvent & acrylics.
As for cellulose just use it for cleaning up the airbrush followed by a lil flush through with pactra thinner, the cellulose stuff will attack lexan. For thinning pactra my 1st choice is the pactra thinners but have used RCS thinners through DMS in the past when I could not source the pactra gear
