Does water stay on your boat cover after rain? Does the fabric turn dark quickly or look less fresh than it used to? It may feel like your boat cover needs replacing.
In most cases, that isn’t true. What you’re seeing is not worn-out fabric, but lost protection.
With the right impregnation product, you can restore the water-repellent performance of your boat cover and significantly extend its lifespan. And you can do it yourself — at home, on your driveway, or in the marina.
Why boat covers lose their water repellency
Boat covers are made from synthetic outdoor fabric. This material is strong, but it is constantly exposed to:
- Rain and spray water
- Sunlight and UV
- Salt, dirt and bird droppings
- Repeated wetting and drying
Over time, the original protective effect wears off. The fabric itself is often still in good condition, but water and dirt can penetrate the fibres more easily.
You notice this when:
- Water no longer beads off the fabric
- The cover looks dirty more quickly
- Dirt and moisture stick more easily
- The material ages faster
When is an impregnation product really suitable for a boat cover?
Not every impregnation spray is suitable for synthetic boat fabrics. The best impregnation product does more than just “make it waterproof”.
Good protection:
- Restores water-repellent performance
- Allows the fabric to breathe
- Reduces the adhesion of dirt and moisture
- Is safe and easy to use
Many standard sprays form a layer on top of the fabric. That effect is often short-lived and can seal the material. A good protector works inside the fabric.
The solution for synthetic outdoor fabrics
Ultramar Sprayhood & Tent Protector is specially developed for synthetic outdoor fabrics such as boat covers, cockpit tents and biminis.
What you see after application:
- Rain beads off the fabric immediately
- The fabric remains flexible and breathable
- Dirt and moisture adhere less easily
- Your boat cover stays clean for longer
The protector penetrates deep into the fibres and creates protection from within. This ensures a longer-lasting effect, even with regular exposure to sun and rain.
Ultramar maintenance products are PFAS-free. That means they are safer for you, your boat and the environment — without compromising performance.
How the Ultramar 3-step maintenance process works
For reliable and long-lasting results, Ultramar always follows a clear three-step process.
Step 1 – Cleaning
Remove dirt using a cleaner designed specifically for synthetic outdoor fabrics. Household cleaners are not suitable.
Step 2 – Treat deeply embedded contamination (if needed)
If discoloration remains after cleaning, treat those areas specifically so the fabric becomes even again.
Step 3 – Protection
Apply Sprayhood & Tent Protector generously to clean, dry fabric. This restores water repellency and helps reduce future contamination.
This order matters. Protecting without proper cleaning always results in shorter-lasting protection.
Why this is ideal for home use
- Ready to use — no dilution needed
- Easy to apply
- Can be applied in sunlight
- No strong odour
That’s why Ultramar is used by consumers as well as by sailmakers and convertible specialists. Not because it requires specialist skills, but because it delivers reliable results.
Frequently asked questions
Is this suitable for my boat cover?
Yes, as long as your boat cover is made from synthetic fabric such as polyester or acrylic. For cotton or canvas, use Ultramar Canvas & Cotton Protector.
Do I need to clean first?
Yes. Only clean fabric allows the protector to penetrate properly and work evenly.
Can I apply this myself?
Yes. This product is designed for home use and does not require specialist knowledge or equipment.
Is PFAS-free really effective enough?
Yes. Ultramar offers PFAS-free maintenance products that provide strong, long-lasting protection.
How do I know if I’ve used enough?
The fabric should be well saturated. If it no longer absorbs liquid, you’ve applied enough. A second layer is always possible.
How often should I re-impregnate?
On average once or twice per year, or always after a thorough cleaning.
The product that makes the difference
Sprayhood & Tent Protector
- For synthetic boat covers, tent fabrics and convertible roofs
- Makes fabric water- and dirt-repellent
- Allows the fabric to breathe
- PFAS-free and suitable for home use
Available in 1 litre, 2.5 litre and 5 litre sizes. We recommend choosing slightly more rather than too little. Extra product is useful for a second layer, touch-ups or future maintenance.
Ultramar helps consumers clean, maintain and protect boat covers, tents, convertible roofs and other outdoor fabrics themselves, using PFAS-free maintenance products and a proven three-step maintenance process.
For current prices and availability, visit the Ultramar website or an official Ultramar dealer.
