You ask a good question and a question that comes up from time to time.
I've seen a few detailers in my life that have tried to argue that wax, or "sealant" or a "coating, you know, the
LSP or
Last Step Product isn't important or isn't a factor because the polishing step is where the actual magic takes place.
I disagree.
A lot.
All pro-grade polishes I know of are
dedicated products, that means they are dedicated for a single dedicated purpose, that is to in some fashion abrade the paint as part of a process to perfect it.
Most if not all of these products are also
body shop safe. This means they contain no ingredients that would cause water to bead up like a wax because this would contaminate a body shop, (fresh paint environment), and this type of contamination can lead to surface adhesion problems. Surface adhesion problems result in what the average guy calls Fish Eyes.
What the above two things mean is that these pro-grade compounds and polishes don't have any ingredients in them that
lasts. You see, wax lasts because it's
NOT water soluble. Most compounds and polishes are water soluble, they are not meant to last, that is seal the paint with a
sacrificial barrier coating of protection that will hold up to
repeated washing,
wiping and
rain. No they are meant to perfect the paint and then be wiped off.
A wax, or a synthetic paint sealant or a paint coating, these are product that are designed to
l-a-s-t.
Isn't that what everyone wants? A wax that lasts a long time?
So the results a high quality polish will create can and will look damn good. But these "appearance results" will diminish as the polishing oils wash off, get wiped off or get rained off or even vaporize off the paint.
By
sealing the paint with a product designed to last, that is a product that is
not water soluble, i.e. a wax, synthetic sealant or paint coating, you lock-in these appearance results.
Not only that... a quality wax, synthetic paint sealant or coating will create a
UNIFORM appearance. Polishing doesn't do this, it comes close but under good lighting after wiping all the polish off you can see variable in the finished results.
At least I can.
A quality wax, synthetic sealant or paint coating fixes this by creating a uniform appearance and that
improves the results created by the polish.
That's 2 things a wax will do, make the results from polishing
last over time and
create a uniform appearance.
Here's one more thing a quality wax, synthetic sealant or paint coating will do and that's amp up the gloss, clarity, depth and shine. This is a no-brainer because any chemist that's worth his salt creates formulas that provide these types of aesthetic characteristics
b-e-c-a-u-s-e that's what the market wants from a wax. By the word
market I mean use
human beings.
A wax, synthetic paint sealant or paint coating can also create a more slippery surface and a slick or slippery surface can at a minimum help to ward off micro-scratching, (in my humble non-engineer opinion), and the other bonus to this relates back to human beings like their paint to feel slippery.
I also think a quality wax, sealant or coating makes
washing faster, easier and safer and this goes for
drying too.
There's also some element of protection from UV rays plus just the fact that you have a
sacrificial barrier coating on top of the paint means that anything that will attack the paint will first have to make this barrier coating
sacrifice itself, that is give itself up before the offending attacker can get to the actual paint.
A quality wax, synthetic sealant or paint coating can also provide some level of
masking or
hiding by filling in microscopic imperfections to create a more perfect visual appearance and this is why applying a wax, sealant or coating can take the results from polishing to an even higher level.
I think that's 8 benefits I've listed that applying a quality wax, sealant or coating provides if you count how wax makes washing safer and drying safer as two benefits.
The above is all off the top of my head.... I may have missed a few key points and if I think of them later I'll add them to this thread.
Good qustion... I'm glad you asked it...
Now my buddy just picked up his 1932 Ford Deuce Coupe and I took some
SUN SHOTS showing just how beautiful his freshly waxed ride looks. Hang tight and I'll show you plus document the paint is swirl free.