You can see here how it cracked and peeled all over the door.
So the first thing I do is scrap and sand and try to get off as much of the previous paint job as I can. I can't get it all off but I do what I can. Then I clean the door real well and prime it with an acrylic primer tinted a Sherwin Williams color called Tatami Tan. Once that is dried I can start to paint on the wood grain pattern on the garage door. In the next photo you can see where I have painted in the centers to all the panels. I use a lot of tape when I paint a garage door because I tape off all the panels so I don't get any over painting.
After I get the centers done I paint the wood grain pattern on the vertical pieces of the garage doors. To do this I tape off so the ends will be nice and crisp. I like to use the yellow Frog tape. The yellow Frog tape is for delicate surfaces and won't pull up any painting that I have already done. In the next two pictures you can see how I taped off the vertical pieces and what it looks like after I take the tape comes off.
Nice and crisp ends.
In the next photo you can the difference between the two coats of brown I use. The taped off horizontal space you can see has only the first coat of brown painted on. I always use two coats for the actual wood graining I do. That way it gives the doors a much more realistic wood look. It just creates a richer feel. For this garage door I used Fiery Brown a Sherwin Williams color for the first pass at the wood grain. For the second pass I used the same brown but with black added at about a 1 to 1 ratio.
The last two photos show the completed project. You will notice that the angled part of the center panels is darker than the rest. I like to do that because it does what I call 'picture frame' the panels and that to me dresses up the door with a more finished look.
After the garage door is completely painted to look like wood and dried I apply two coats of a clear acrylic top coat.
If anyone would like to have the full written instructions to painting a garage door to look like wood just email me at firstname.lastname@example.org