See the ASTM test results of Rhinoguard versus Penofin and many others. Rhinoguard retains color 3.72 times longer than Penofin. No, many expensive automobiles' paints do not have transoxide pigments. Transoxide pigments are produced in two shades, red and yellow oxide. Opaque and transparent pigments do not affect the toughness of an automobile finish.
Some penetration is necessary for an interior stain to be effective.
The amount of penetration does not determine the material's quality. Again it's the total formula that counts. Exterior siding stains with an acrylic or polyvinyl acetate vehicle have practically no penetrating ability, but otherwise properly formulated they have excellent durability. Of course, Rhinoguard being an exterior coating, of all things, should not be easily removed while in its viable state. That's why our material lasts.