50 might be stiff.
I just redid the seats for my 68 Fury. I used high density foam (1.8) with 44lb compression for bottoms and high density / 36lb compression for backs. Feels not too stiff, not too soft. I also used Dacron over the foam to make the covers look nice and inflated.
I painted my car in my garage this summer. I installed multiple intake filters and put a big box fan in the window. One fan was sufficient for extracting fumes/overspray out. I put a screen furnace filter in the front of the fan (I think AC/heat guys call it rock catcher) and that filter was...
I used to order powder from ebay seller powdercoatpaints - plenty of colors and good customer service, their prices worked for me. Never had any problems with powder (I usually order 1 to 5 LBs). Mostly used their super durable wet black (awesome color, surface finish and thickness), graphite...