I do not know what a sealant is,I always thought that putting more than one product over another was useless as one just took the other off.
This is the short version as I know it.
Sealants are (usually) polymer type synthetic products, not "natural" wax.
It is impossible to market the "average Joe consumer" on the differences.
There are many sealants on the market some even use the word "polish".
Sealants (as a rule) have more longevity & durability than a "natural" wax.
Confused yet?
How about Meguiars Ultimate Liquid Wax..the longest lasting wax Megs makes.
It is actually a sealant! No wax at all!
So if that's not confusing enough...
Some paste waxes are actually a combination of both natural and synthetic.
Some paste waxes have no natural wax in them at all. Got a headache yet???
Someone else chime in here to point him in the right Sealant vs. Wax direction.
Now on to the...applying one (wax/sealant) Last Step Product (LSP) over another.
The General rule:
Wax can be applied over itself except a "cleaner wax" will strip off the prior coat.
Wax can be applied over a sealant but a sealant should not be applied over wax.
Multiple coats of sealant/wax (IMHO up to three) can/will increase look and durability.
I know one person that actually has applied more than 30 coats of Z-2 to his vehicle.
REMEMBER George McFly:
"Now, Biff, I want make sure that we get two coats of wax this time, not just one."
Multiple coats also insures complete coverage.
I like 2-3 coats of sealant followed by 2 coats of wax.
On black/red colors my fav is Blackfire "The Wet Ice Over Fire" sealant/wax combo.
I washed my truck today using two bucket system,used rain x car wash soap,clay bar it with Meguiars,and used collinite insulator wax.
There are many "car wash soaps" out there. I'm personally not a big fan of Rain-X.
I only clay or do any correction "if needed". Did you do a "baggie test" on your paint?
Last but not least IMHO Collinite 845 Insulator Wax is a very good, shiny, durability wax.