In the background of the guy painting the rally wheels you can see water flowing down the back wall of the booth.
The vacuum from this waterfall would suck in the paint overspray so that it could be collected as a sludge, dried out and discarded in a manner befitting hazardous waste.
Ford Motor Company would collect the sludge to polish and sell/reuse as a commerical product (aka "Fordite").
https://fordite.com/
K
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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.56 @ 139 mph best
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