I use finishing resin (PT-40) by pacer Z-POXY only and in the canopy paint IMRON by Du-Pond.
The carb O.S. (type 40B) works very well, has a greater answer, of low rpms to high rpms, has a diameter of (0.3030" ó 7.69mm) and two needles, one for low and another of high rpms. ;D