I am making a huge Pinhole/convertible/lens camera

I want good matte black inside

Dirty white matte outside

Surfaces are new Baltic Birch plywood

Prefer no spray and low smell

At least 60 sq ft inside and out

Maybe rental spray outside as it covers fast

Box is 2X2X3 feet +

The camera back was delivered today, the rest in a week

Later a nose cone bellows