Aminoalkyl-methoxysilyl-terminated dimethyl siloxane

This is the proprietary silane-functional polydimethylsiloxane that Gyeon uses as the bonding active in WetCoat (and likely related Q²M SiO₂ toppers). The molecule is a silicone-oil backbone capped with aminoalkyl-methoxysilyl groups at one end and C13–C15 alkoxy groups at the other. When sprayed onto a wet, clean surface, the methoxysilyl ends hydrolyze and condense with surface hydroxyls (paint clear coat, glass, ceramic-coated panels) to form a thin, hydrophobic siloxane film — the layer that produces the tight beading and "wet look" gloss buyers see immediately.

At the 5–7% concentration disclosed in the Gyeon WetCoat SDS, the ingredient drives the product-level eye-irritation classification (H319). The aminoalkyl group is mildly basic but the product is buffered to pH 7, so skin/eye irritation in normal spray-and-rinse use is limited to the brief contact window before rinse-off. No respiratory sensitizer classification, no aquatic toxicity classification, no Prop 65 listing.