Stop in for a cup of coffee

I've had good luck with this for the tar type undercoat. Just a regulator type knob for pressure. May need thinning. Wax and grease remover works well.
https://www.amazon.com/Astro-4538-Economy-Air-Undercoat/dp/B003D3N7W4/?tag=fabo03-20
https://www.amazon.com/Automotive-R...erial-RUS-1020F6/dp/B000Q6UBQ6/?tag=fabo03-20
https://www.amazon.com/Titan-Tools-19442-Line-Regulator/dp/B00TU3UJTA/?tag=fabo03-20