Nanolex Si3D Review: Five Tiers Under One Confusing Name

Most coating brands sell a simple good-better-best ladder. Nanolex's Si3D family is messier: Si3D is the base DIY product, Si3D APX is a shorter-lived entry option, Si3D Cerabide is a separate DIY-friendly formula aimed at inexperienced users, Si3D HD restricts access to approved detailers, and Si3D Cerabide HD combines the HD and Cerabide chemistries into a fifth, even longer-rated option. None of the five is simply a bigger bottle of another; each uses a distinct formulation.

All five share a polysilazane-family base developed and produced in Germany, but the specific chemistry differs by tier: Si3D uses an advanced polysilazane, Si3D HD a hybrid polysilazane formulation, Cerabide a 3D silicon-carbide matrix with hybrid solid particles, Cerabide HD a combination of organopolysilazane and coated nano-SiO2 particles, and APX a glass-like SiO2 hybrid compound.

Nanolex publishes durability in kilometers and wash counts rather than a flat years figure for most tiers, which is more specific than many competitors but harder to compare directly against a US buyer's annual mileage.

Si3D HD is explicitly marketed as detailer-only, both on Nanolex's own product page and by UK retailers that gate the listing behind an approved-detailer requirement. The restriction appears tied to application difficulty and the need for consistent indoor conditions to hit its longer 75,000 km rating, not to a certification or auditing program the way Gtechniq or Ceramic Pro restrict their top tiers.

That means there is no public Nanolex-branded guarantee behind an HD install, just a gatekept product. One UK detailer's own installed quote for a single-stage polish plus Si3D, with a self-issued 2 year, 20,000-mile claim, landed around £495 before being negotiated down to roughly £320, a figure that forum commenters called high relative to comparable work from other shops.

Only Si3D HD carries a specific hardness figure in official marketing, cited as 9H+. Base Si3D, Cerabide and APX do not carry an official pencil-hardness number; one UK retailer assigns its own 9 out of 10 hardness rating to base Si3D, which is a retailer opinion rather than a manufacturer pencil-test result. No tier publishes an exact micron thickness; Nanolex's own language describes the cured layer only as "several microns thick."

This thinness of published hard data is a real gap compared with brands like CarPro, which cites an exact 70 percent SiO2 content, or Gyeon, which splits its durability claims cleanly by layer count. Nanolex buyers are mostly working from durability-by-kilometer figures and brand reputation rather than a full data sheet.

Base Si3D at roughly $69 for 30ml is competitively priced against Gyeon Mohs EVO and CarPro CQuartz UK 3.0, and its 30,000 km rating is a reasonable, if modest, claim for a DIY coating. Si3D Cerabide and Cerabide HD look like the better value within the family for buyers who can access them, given their higher kilometer ratings, though full US retail pricing for those two tiers was not consistently published during research and should be confirmed with a Nanolex-authorized retailer before buying.

Si3D HD is worth seeking out only if you can find an approved detailer locally, since its restricted access and lack of a documented warranty mean you are paying for chemistry and application skill, not for a backed guarantee. Across the whole family, treat Nanolex as a solid, German-engineered option without the paperwork depth of Gtechniq, Ceramic Pro or CarPro at the professional end.