Soft99 Ultra Glaco window sealant 70ml

Up to 12 months of clear vision in the rain with Soft99 Ultra Glaco

What makes Soft99 Ultra Glaco special? Ultra Glaco uses fluoropolymer-based Fusso technology to create a hydrophobic layer on vehicle glass that lasts up to 12 months — raindrops bead off independently at speeds as low as 45 km/h, without the need for wipers.

The Soft99 Ultra Glaco is the most powerful windshield sealant in the legendary Glaco series from Japan. What sets this product apart from ordinary rain repellents: Its proprietary fluoropolymer-based Fusso technology forms a chemically extremely resistant protective layer that neither aggressive cleaning agents nor mechanical stress from windshield wipers will remove within a few weeks. For the user, this means a glass sealant that works reliably for months—in the rain, on highway drives in autumn, and when scraping ice in winter mornings. With 70 ml of content, one bottle is enough for up to five complete windshield treatments, which also makes Ultra Glaco one of the best options economically in the field of glass sealants.

• Fusso-Fluoropolymer Technology for up to 12 Months Durability. Unlike classic silicone-based rain repellents, Ultra Glaco relies on fluoropolymers—the same technology base also used in Soft99 Fusso Coat 12 Months for paint sealing. In practice, this means: The coating resists regular car washes, aggressive glass cleaners, and permanent windshield wiper stress significantly longer than conventional glass sealants.
• Self-cleaning effect from 45 km/h driving speed. As soon as you are on a country road or highway, raindrops are reliably carried off the windshield by the airstream. This very effect often makes the windshield wiper completely superfluous in moderate to heavy rain—a real safety gain, because visibility remains consistently clear.
• Year-round protection for windshield and side windows. In spring and summer, the smooth surface significantly reduces the adhesion of insect residues and pollen film. In winter, the hydrophobic layer prevents frost and ice from sticking stubbornly—morning ice scraping is much faster and gentler on the glass.

Practical tip from Detailing1: In practice, we recommend thoroughly pre-treating the windshield with Glaco Glass Compound Roll On before applying Ultra Glaco. This removes old sealant residues, oil films, and stubborn limescale deposits—and ensures optimal adhesion of the Fusso coating. Without this step, durability can be several months shorter.

How Fusso Technology in Ultra Glaco Works — and Why Fluoropolymers Make the Difference

Most window sealants on the market are based on silicones or simple wax compounds. These products create a short-term beading effect but are worn away by windshield wipers, cleaning agents, and UV radiation within a few weeks. Soft99 Ultra Glaco takes a fundamentally different approach: Fusso technology uses fluoropolymers—chemically extremely stable compounds that bond with the glass surface at a molecular level. Fluoropolymers are known for their exceptionally low surface tension. In practice, this means that water cannot form a continuous film on the treated windshield but immediately contracts into drops. This effect is known in chemistry as a hydrophobic coating and is so pronounced with Ultra Glaco that raindrops move upwards independently and flow off the windshield even at moderate driving speeds. A common beginner's mistake is applying it to glass that has not been completely degreased. Even invisible grease films—for example, from exhaust fumes, sealant residues, or tree sap—prevent the fluoropolymers from binding correctly to the glass. The result: patchy areas that cause water to run off unevenly and create irritating streaks at night when facing oncoming traffic. Those who take this preparation seriously will be rewarded with a uniform, long-lasting coating.

Applying Ultra Glaco correctly — step by step to the perfect window sealant

The application of Ultra Glaco is straightforward but requires thorough preparation. First, clean the windshield thoroughly with a glass cleaner—ideally with Glaco De Cleaner for basic cleaning or Glaco Glass Compound Roll On if old sealants or stubborn residues are present. The windshield must then be completely dry. Next, gently press the integrated felt applicator of Ultra Glaco onto the windshield and spread the liquid in even crosshatch movements over the entire surface. Work quickly and overlap to ensure no spots are left untreated. After 5 to 10 minutes of drying time—you'll know it's ready when a slight whitish haze appears on the glass—wipe off the residues with a clean, slightly damp microfiber cloth. Crucial for full durability: The windshield should remain protected from moisture for at least 12 hours after application. In practice, this means it's best to apply it in the evening in the garage and allow it to cure overnight. Applying Ultra Glaco at temperatures below 10°C or above 30°C risks uneven curing. The ideal temperature range is between 15°C and 25°C.

12 months of window sealing — what you can realistically expect in terms of durability

Soft99 states a durability of up to 12 months for Ultra Glaco—and this is quite realistic under optimal conditions. Independent long-term tests confirm that the beading effect is still clearly noticeable after one year, 16,000 kilometers, and over a dozen hand washes. The water repellency works strongest in the first four to six months: raindrops are reliably carried away by the airstream at speeds as low as 45 km/h. After about six months, this threshold typically shifts to 60 to 70 km/h, and after one year, you'll need more like 80 to 90 km/h for the full effect. This is a natural degradation process—and even after 12 months, the remaining coating still offers a measurable advantage over untreated glass. In everyday use, this means: Those who drive a lot on highways and country roads benefit massively throughout the entire period. In pure city traffic below 40 km/h, the self-cleaning effect naturally occurs less—in this case, you should realistically reapply every four to six months to maintain the effect consistently. Car washes with brushes also significantly reduce durability because the mechanical friction wears away the fluoropolymer layer faster than contactless hand washing.

Ultra Glaco vs. Glaco DX — which Soft99 window sealant is right for you?

Within the Glaco family, Ultra Glaco and Glaco DX are the two premium options—but they are designed for different user profiles. Ultra Glaco focuses on maximum durability through Fusso-fluoropolymer technology: Up to 12 months of durability is its clear unique selling point. Glaco DX, on the other hand, uses the newer SARF technology (Strong Adhesion + Rapid Finish) and offers durability of up to four months—with noticeably easier application and a larger felt applicator that effortlessly reaches hard-to-access corners. In practice, it shows: Ultra Glaco provides a stronger beading effect at low speeds (from 45 km/h vs. 60–70 km/h for DX), but requires more careful preparation and a longer curing time. Those who want to fundamentally treat their windshield once a year and then have peace of mind for months choose Ultra Glaco. Those who prefer a quick, uncomplicated refresh every three to four months are better served with Glaco DX. For comparison from the competitive environment: Premium alternatives like Gyeon Q² View offer even stronger water runoff at very low speeds, but are significantly higher priced and require more elaborate preparation. Ultra Glaco hits the sweet spot of durability, performance, and value for money.

Who is Ultra Glaco best for — buying recommendation and target audience

The Soft99 Ultra Glaco is the ideal window sealant for drivers looking for a long-lasting solution and willing to invest a little more time in the initial application. Frequent drivers, commuters with regular highway and country road routes, and anyone who washes their vehicles by hand particularly benefit—because here the Fusso coating lasts the longest. If you have several vehicles in the family, a 70 ml bottle goes particularly far: Up to five windshields can be treated with it. Ideally, combine Ultra Glaco with Glaco Glass Compound Roll On for preparation and Glaco Blave for plastic covers on headlights or helmet visors, which Ultra Glaco is not suitable for. For side mirrors, we recommend Glaco Mirror Coat Zero—it is specially formulated for mirror surfaces and complements Ultra Glaco to create a complete glass protection package. The only limitation: Those who drive exclusively in city traffic below 40 km/h will rarely experience the full beading effect. In this case, Glaco Q with its 2-in-1 formula of cleaner and sealant is the more pragmatic choice, as it can be refreshed faster.