OK, I'll take a stab at it.

First off, Den Mat products are overpriced crap.
You can get better materials for lower cost.

Second, there is no way to make a 'no-prep' dental restoration.
The restoration, especially porcelain, must have some thickness
for strength.
The stupid  'contact lens' marketing is laughable, even lenses
for the eye have thickness, and are for a vastly different function.

Thirdly isolation during the 'bonding' procedure is paramount..!!!
You cannot bond in a wet field with current materials, despite the
hype of 'wet field bonding'.

Have been using Calibra for porcelain veneers for years.
Only two failures in 20 years, and that was due to fractured
porcelain because of abnormal incisal forces.
<0.01% failure rate.

Veneer cases must be protected from parafunction, include
a night guard of your choice.
Recommend the NTI;  include it for 'free' at delivery.

My SisTaH <AmatusCremona> has a couple of decades of experience
bonding porcelain restorations.
If you are lucky, and she has a mind to chime in,
you may receive a couple of diamonds of porcelain bonding info.

Lastly, my advice to you is to immediately cease and desist from
providing 'Lumineers' .

The concept is faulty, despite the success of the media
blitz campaign.

Provide all of your previous  'lumineer clients' with *any* type of
night-guard as soon as possible.

Best wishes, Frenchy in London,
-newB