A general rule of thumb goes like this,
Apply 2 coats when it comes to a wax or paint sealant, here's why,
- Ensure a uniform coverage over 100% of the body panels
- Ensure a uniform appearance over the entire car
One of the reasons for the above is because the average do-it-yourselfer or weekend warrior isn't a pro at this and can and will miss a few spots or won't evenly apply and work the product over the entire surface. Sometimes this comes from rushing, sometimes just un-perfected technique. So by applying the product twice, chances are pretty good that after the second application all portions of the paint have been adequately coated.
Also, lots of Joe Consumer types are working by hand and the human hand will never do as good a job as a machine like the PC style polishers.
Pros on the other hand are good at applying waxes and sealants either by hand or machine and can easily so a great job of evenly and thoroughly applying a coat of wax or paint sealant using only a single application.
Sometimes I apply one coat. Sometimes I apply two coats. Usually if I apply two coats it will be of the same product just to ensure uniform coverage. Sometimes I'll apply two coat using two different products and sometimes this is just for sport.
1972 Corvette Stingray - Extreme Makeover - Process and Products Used
Next we machine applied Prima Banana Gloss using Flex 3401 DA Polishers with Griot's Garage Waxing Pads
We topped the Prima Banana with Dodo Juice Banana Armor using LC Gold 5.5" Jeweling pads on both a Meguiar's G110v2 and a Porter Cable 7424XP
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