Always use Rutile grade for exterior coatings. Anatase TiO2 is photocatalytically active — under the intense UV radiation of UAE and Saudi Arabia, it promotes oxidation of the organic binder, leading to chalking, loss of gloss, and premature film degradation. Rutile TiO2 (especially chloride-process grades with Al₂O₃/ZrO₂ surface treatment) converts UV energy to heat without degrading the binder — dramatically extending exterior coating service life. For interior applications where UV exposure is minimal, anatase TiO2 is acceptable and offers slightly better brightness.