This is very easy.
Step 1: Painting Tools
I use the cheapest paint, and a paint brush.
The paint I have left from previous use.
Step 2: Nicely
Very nice feeling when in dunk brush in paint.
Step 3: Painting Technology
On the old doors, paint the first layer to be applied with a brush, and carefully rub. Thus, the paint is absorbed in the smallest details. Then, if desired, you can already go through a second coat of paint.
The main thing to paint with a brush, and it is good to rub the paint. To smear it is undesirable. And you need to vter.
Step 4: Before and After
This is the result of mini restoration.