Oxidized boat gelcoat — how to restore and protect with ceramic coating
Gelcoat is the outer layer of polyester resin that protects the boat's hull. With continuous exposure to UV rays, saltwater, and atmospheric agents, this layer gradually degrades. The surface loses its shine, becomes opaque and rough, and the color whitens. This process is called gelcoat oxidation and is very common in Portugal and Spain, especially in boats exposed year-round to intense sun and the saltwater of the Atlantic and Mediterranean.
Signs of oxidized gelcoat include a dull or whitish surface with no visible reflection, a rough texture to the touch similar to fine sandpaper, yellowish or brownish stains on the hull, water that no longer beads, and salt or algae deposits that are difficult to remove with normal washing.
The complete restoration process always follows the same mandatory sequence: wash, decontaminate, cut the oxidation, polish, prepare the surface, and protect with ceramic coating. Skipping any step compromises the result and the durability of the protection.
The first step is washing with Nasiol Cleanion Pro Marine, a professional marine shampoo with a pH of 12.5 to 13 that removes marine dirt, salt, algae, and organic residues without damaging the gelcoat. It can be applied with a foam lance at a 1:1 dilution or in a bucket with 20 mL in 10 liters of warm water.
The second step is decontamination with Nasiol TEM APC Pro Marine, a universal cleaner with a pH of 10 to 10.5 that eliminates grease, oils, wax residues, and ingrained mineral deposits that shampoo cannot remove. Dilute 1:45 in water, spray on, and rinse thoroughly.
The third step is cutting the oxidation with Nasiol M1000 First Step, a heavy-cut compound equivalent to P1000 grit with 40 percent gloss capacity. Compatible with rotary and orbital machines. Work in 50 by 50 centimeter sections and always remove residues while fresh with a microfiber cloth.
The fourth step is polishing with Nasiol M1500 Second Step, a finishing compound equivalent to P1500 with a 60 percent gloss rate. It eliminates the micro-scratches left by M1000 and refines the surface to a mirror-like finish ready to receive the ceramic coating.
The fifth step is preparation with Nasiol Clean Marine, a neutral pH degreasing cleaner between 5 and 5.5 that acts as a primer for nano-coatings, maximizing coating adhesion and durability.
The sixth step is the application of the Nasiol MarineCoat One ceramic coating, the top-of-the-range coating in the Nasiol Marine line. 10H hardness, film thickness between 800 and 1100 nanometers, water contact angle of 107 degrees, 96 gloss rate, and chemical resistance between pH 1 and 12. Apply with an applicator block and suede cloth in a cross-hatch pattern with a consumption of 4 to 5 milliliters per square meter. Cures in 24 hours. Wait 48 hours for washing with detergent. For faster application, Nasiol MarineCoat Fast offers 7H hardness in a spray format with immediate buffing.
Complete vessel protection includes Nasiol DeckCoat for decks and wood, Nasiol GlassCoat Marine for glass and windows, and Nasiol FabricCoat Marine for upholstery and exterior fabrics.
The recommended maintenance routine for boats in Portugal and Spain is as follows: washing with Cleanion Pro Marine after each outing or fortnightly, decontamination with TEM APC Pro monthly, gelcoat inspection at the beginning and end of each season, restoration with M1000 and M1500 whenever signs of oxidation appear, and reapplication of MarineCoat One at the beginning of each season.
The Nasiol Marine range was developed for demanding marine environments with resistance to saltwater, UV rays, and temperature variations on the coasts of Portugal and Spain. All products are REACH certified. Detaildawg is the official Nasiol distributor in Portugal and Spain, with delivery to the entire national territory, islands, and the Iberian Peninsula. Products available at detaildawg.com/collections/nautico-autocaravanas