I finally built a good sized spray booth suitable for large 1:32 and 1:20.3 models. To accommodate a 1:32 heavyweight sleeper that is almost 36 inches long, made the booth 48 inches wide by 24 inches deep (122 cm wide x 61 cm deep). Constructed from aluminum. Downdraft air flow pulls over spray and fumes into filters below. The blower is separate. Top is clear acrylic with an LED light facing down, and there are two LED panel lights angled from each side, providing virtually shadowless lighting. The pink filter sheet atop the perforated stainless work surface is the first filter stage. Catches most over spray and dribbles.
There are two filter stacks under the work surface:
> 1-inch pleated paper filter to catch most particulates
> 12-inch felted fabric bag filter to catch fine particulates
> 2-inch granulated activated charcoal bed to absorb organic volatiles
> 2-inch granulated activated charcoal bed to absorb organic volatiles
> 1-inch pleated paper filter as a final filter
The Magnehelic differential pressure gauge monitors the air flow across the filters, providing an indication that filters should be inspected and maybe changed.
I tested spraying Floquil paint that has a toluene/xylene solvent base. The filter stack absorbed well enough that I could not smell solvent in the exhaust. Of course, good practice is to vent outdoors and not risk breathing organics that can cause a myriad of health issues!
This is serious business!
Stuart
Holy cow, that's industrial grade!