We need to paint a 21 foot by 8 foot porch ceiling that is broken up
into 50 small rectangles by rafters and cross bracing. What would be
the best way to do this?

Would an inexpensive Wagner airless paint sprayer with a tube that goes
into the paint can work well for this? (We would be using latex paint.)
Thank you in advance for all replies.
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the only way I could keep my cat off the kitchen table
would be to tie him up with a cable
then he would be unable
to get on the table