honestly i couldn't tell you how many coats. It's one of those things that you do by looking....When it's dark enough to you....Wal lah it's almost done.....Now as far as between coats: My best advice is to do it all in the direct sunlight making sure there is not much in the air such as dust or dirt, you will be able to tell when it has dried...usually taking between 15 to 30 minutes pending on temp outside...My personal truck i used probably 1 1/2 cans........NOW for the important stuff...
1. Take about 1000 grit sand paper with soap and water and sand each light till it turns foggy( be able to tell when it's dry)
2. Then take 1500 grit sand paper and repeat process, try to make it even as possible....
3. Wash off lights with regular tap water
4. Dry off lights with clean rag or paper towel...
5. Let sit in sun and warm up, also the can too....
6. Spray coats till happy remember to let dry inbetween
7. After it has dried it will look alittle flat, so get some clear coat and spray 1 coat of it as well, but be careful, i usually have to spay the clear coat pretty close to get a good coat on there i would say under 8 or 9" away....
8. Then let dry and you should be done...
Reminder: I would HIGHLY RECOMMEND practicing this first before testing on your truck lights....I did this many times before actually charging for this....
-----------AND AS ALWAYS GOOD LUCK---------
JEFF