Good questions!
1.) How
I feel about using glazes.
To me, glazes are products used for aesthetic purposes. They provide gloss and often the "wet-look", but do not provide much, if any, protection. IMO...Protection comes from using/applying waxes, sealants, coatings to a paint's surfaces.
Glazes are also often used on the show-car circuit; and/or, when one feels they are at 'the limit of correcting' and still want to 'hide' some of the paint's blemishes.
Glazes are usually formulated with very fine micro-abrasives that will help polish/jewel/burnish the paint, but they generally
won't remove any paint blemishes. These micro-abrasives, combined with either natural/man-made waxes, (among other ingredients), help
"fill-in" some of these paint blemishes without removing them. But these "fill-in" characteristics usually don't last very long.....a good car-washing session or a heavy rain will also help in a glaze's demise.
2.) Sealants Bonding Issues.
We are constantly reminded that sealants will have the
'best bonding' with a paint surface that is totally void of any (polish/wax/oils/etc.) substances, that the paint should be "squeaky clean". That squeaky-cleanliness should also assure the sealant will obtain its best longevity.
It would seem, then, IMO, that glazes would/could interfere with sealants achieving their
'best bonding'. As you have mentioned....Some car care products 'manufacturers' do say otherwise.
Things to ponder:
a.)What are the possibilities of extending the life/usefulness of glazes?
i. A wax will apply over a glaze....a sealant may encounter some problems bonding (cross-linking) to the oils/waxes in a glaze.
ii. I realize that the technologies of glazes/waxes/sealants are being vastly improved at a high rate of speed to meet today's OEM's paint demands...therefore, some 'bonding' issues could be or are being overcome.
b.) If one is to use a glaze, then either apply a pure (without any 'cleaners') carnuba wax....Or,
Use them to help 'polish' the paint. Then use your paint surface cleaner (Erasure, IPA, Mineral Spirits, for example) to ensure the "squeaky-cleanliness" of the paint's surface and then apply your sealant of choice.
Note: The uniqueness of Meg's #7 ingredients is that, even though it's called "Show Car Glaze" it's a true "pure polish" (with no abrasives)....not a glaze. Mr. Phillips has addressed this many times.
The same as Klasse Sealant Glaze....its an acrylic sealant...not a glaze.
As such, remember there are no set-in-stone industry standards on how car care products may be labeled, or as I say, 'mis-labeled'. Mr. Phillips has stated to judge a product on how it performs, not what it says it is on the label.
BTW: I
really like Meg's #7 or 3M Imperial Hand Glaze for indoor car shows.
But will these products "work" on modern BC/CC like they do on SS? BC/CC paints are said to be more dense, therefore, I suppose, less porous than SS.
But how this 'more denseness' will affect the absorption rate of the above mentioned products is debatable.
I still like them though.
Just a few of my thoughts on glazes.
Bob