Use a small roller to quickly roll on the paint.
Paint interior door panels.
Put plastic on the floor and wall where you plan to lean the door.
Next paint the interior panels.
Paint the recessed panels the horizontal rails and then the vertical stiles if the door has panels.
Typically there are two square panels on top two rectangular panels in the middle and bottom.
The brush should be going in the same direction as the wood grain.
Clean the door with basic household cleaner.
Begin by applying paint to the inside of the top panels.
Paint a raised panel door with a brush and paint with the natural grain of the wood.
When painting a panel door a paint brush may be more effective than a roller.
Then use a brush to smooth it out and fill in missed spots.
Coat the interior car door panel with two coats of flexible vinyl spray paint.
Smooth out the paint working with the grain.
Wait two hours between coats.
Maintain an 8 inch distance between the panel and the spray nozzle as you apply.
First paint the edges around the door top sides and bottom.
Painting around the panels is time consuming making it difficult to keep a wet edge.
Paint the first side of the door.
Cover hinges with painter s tape if you want to keep them free of paint.
Starting at the top working your way down by sections doing the details with a brush and the flat surfaces with a roller.