Soft99 Ultra Glaco Glass Sealant 70ml

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

What makes the Soft99 Ultra Glaco special? The Ultra Glaco uses fluoropolymer-based Fusso technology to lay down a hydrophobic layer on automotive glass that lasts up to 12 months — raindrops bead off on their own from 45 km/h, no wipers needed.

The Soft99 Ultra Glaco is the most powerful glass sealant in the legendary Glaco line from Japan. What sets it apart from run-of-the-mill rain repellents: the proprietary fluoropolymer-based Fusso technology forms a chemically tough protective layer that neither aggressive cleaners nor the mechanical wear of wiper blades strip off within a few weeks. Day-to-day, that gives you a glass sealant that keeps working reliably for months — in the rain, on autumn motorway runs, scraping ice off the windscreen on a winter morning. With 70 ml in the bottle, a single one covers up to five full windscreen treatments, which makes the Ultra Glaco one of the best-value options in the glass sealant world too.

• Fusso fluoropolymer technology for up to 12 months of life. Unlike classic silicone-based rain repellents, the Ultra Glaco runs on fluoropolymers — the same tech base used in the Soft99 Fusso Coat 12 Months for paint sealing. What we see day-to-day: the coating shrugs off regular car washes, harsh glass cleaners and constant wiper wear far longer than conventional glass sealants.
• Self-cleaning effect from 45 km/h. Once you're out on the open road or the motorway, the airflow carries raindrops off the glass for you. That's exactly the effect that often makes the wiper completely redundant in moderate to heavy rain — a real safety gain, because your view stays clear the whole time.
• Year-round protection for windscreen and side windows. In spring and summer the slick surface cuts how hard bug splatter and pollen film stick. In winter the hydrophobic layer stops frost and ice from digging in so stubbornly — the morning ice scrape goes much faster and is gentler on the glass.

Detailing1's tip from the shop: What we see day-to-day: prep the glass before you lay down the Ultra Glaco by giving it a thorough going-over with the Glaco Glass Compound Roll On. That pulls off old sealant residue, oil films and stubborn limescale — so the Fusso coating bonds as well as it can. Skip this step and durability can come up several months short.

How the Fusso technology in the Ultra Glaco works — and why fluoropolymers make the difference

Most glass sealants on the market are built on silicones or simple wax compounds. They give you a beading effect short term, but wipers, cleaners and UV strip them off within a few weeks. The Soft99 Ultra Glaco takes a fundamentally different route: Fusso technology uses fluoropolymers — chemically rock-stable compounds that bond with the glass surface on a molecular level. Fluoropolymers are known for their exceptionally low surface tension. In plain terms: water can't form a continuous film on the treated glass, it pulls itself straight into beads. The chemistry calls this a hydrophobic coating, and on the Ultra Glaco it's so pronounced that raindrops start travelling upward and running off the glass on their own at even moderate speed. A classic rookie mistake is laying it down on glass that isn't fully degreased. Even invisible oil films — from exhaust fumes, sealant residue or tree sap — keep the fluoropolymers from binding to the glass properly. The result: patchy spots that let water run off unevenly and throw up annoying streaks at night against oncoming headlights. Take the prep seriously and you're rewarded with an even, long-lasting coating.

Applying the Ultra Glaco the right way — step by step to the perfect glass sealant

Applying the Ultra Glaco is straightforward, but it takes clean prep. First, clean the windscreen thoroughly with a glass cleaner — ideally the Glaco De Cleaner for the base clean, or the Glaco Glass Compound Roll On if there's old sealant or stubborn build-up on there. The glass then has to be completely dry. Now press the Ultra Glaco's built-in felt applicator lightly against the glass and spread the liquid in even criss-cross strokes across the whole surface. Work quickly and with overlap so you don't leave any spots untreated. After 5 to 10 minutes of drying time — you'll know it's ready by a slightly whitish haze on the glass — wipe off the residue with a clean, slightly damp microfibre cloth. The key to full durability: keep the glass away from moisture for at least 12 hours after application. In practice that means: best to lay it down in the evening in the garage and let it cure overnight. Apply the Ultra Glaco below 10°C or above 30°C and you risk an uneven cure. The sweet spot sits between 15°C and 25°C.

12 months of glass sealant — what durability you can realistically expect

Soft99 rates the Ultra Glaco for a durability of up to 12 months — and under ideal conditions that's genuinely realistic. Independent long-term tests confirm the beading is still clearly there after a year, 16,000 kilometres and over a dozen hand washes. The water beading is strongest in the first four to six months: raindrops get carried off by the airflow reliably from 45 km/h. After about six months that threshold tends to shift to 60–70 km/h, and after a year you'll need more like 80–90 km/h for the full effect. That's a natural wear-down — and even after 12 months the remaining coating still gives a measurable edge over untreated glass. For everyday use that means: if you do a lot of motorway and open-road driving, you benefit massively the whole time. In pure city traffic under 40 km/h the self-cleaning effect naturally kicks in less — here you should realistically top up every four to six months to keep the effect steady. Brush car washes shorten the life noticeably too, because the mechanical friction strips the fluoropolymer layer faster than contactless hand washing.

Ultra Glaco vs. Glaco DX — which Soft99 glass sealant fits you?

Within the Glaco family, the Ultra Glaco and the Glaco DX are the two premium options — but they're built for different kinds of user. The Ultra Glaco goes all in on maximum durability through Fusso fluoropolymer technology: up to 12 months of life is its clear standout feature. The Glaco DX instead uses the newer SARF technology (Strong Adhesion + Rapid Finish) and lasts up to four months — but it's noticeably easier to apply and has a bigger felt applicator that gets into hard-to-reach corners with no fuss. What we see day-to-day: the Ultra Glaco delivers the stronger beading at low speeds (from 45 km/h vs. 60–70 km/h on the DX), but it asks for more careful prep and a longer cure. If you want to treat your glass once a year and then be left in peace for months, grab the Ultra Glaco. If you'd rather do a quick, fuss-free refresh every three to four months, the Glaco DX suits you better. For a competitive comparison: premium alternatives like the Gyeon Q² View give even stronger water sheeting at very low speeds, but they sit well higher on price and need more involved prep. The Ultra Glaco hits the sweet spot of durability, performance and value.

Who is the Ultra Glaco the best choice for — buying advice and target group

The Soft99 Ultra Glaco is the ideal glass sealant for drivers who want a lasting solution and are happy to put in a bit more time on the first application. The big winners are high-mileage drivers, commuters with regular motorway and open-road stretches, and anyone who washes their cars by hand — because that's where the Fusso coating holds longest. If you've got several cars in the family, a 70 ml bottle gets you a long way: up to five windscreens. Pair the Ultra Glaco ideally with the Glaco Glass Compound Roll On for prep and the Glaco Blave for plastic covers on headlights or helmet visors that the Ultra Glaco can't handle. For wing mirrors we'd point you to the Glaco Mirror Coat Zero — it's formulated specifically for mirror surfaces and rounds out the Ultra Glaco into a complete glass protection package. One catch: if you only ever drive in city traffic under 40 km/h, you'll rarely see the full beading. In that case the Glaco Q with its 2-in-1 cleaner-and-sealant formula is the more practical pick, since it's quicker to top up.