'With your products and explanation, my boat cover is super clean and waterproof again.' - (REVIEW) R. Lancer

'With your products and explanation, my boat cover is super clean and waterproof again.' - (REVIEW) R. Lancer

Does this sound familiar?

  • ... boat cover leaks at the seams
  • ... dirty ingrained stains on the tent canvas
  • ... ugly rain stripes on the side
  • ... dirty stains from bird droppings and insects

Boot Cover Cleaning Impregnation

No problem!

Make your boat cover perfectly clean and waterproof again in 3 simple steps!

  • In steps 1 and 2, you can easily remove those annoying moulds, green deposits and rain stripes, and
  • in step 3 you make the fabric perfectly waterproof again and provide it with extra protection against dirt, mould and algae.

How does it really work?

This is the basis.


First clean with SPRAYHOOD & TENT SHAMPOO to remove all the dirt.

Sprayhood & Tent Shampoo

  • First clean with lukewarm water. Use a soft, sturdy brush.
  • Apply Sprayhood & Tent Shampoo to the wet cloth. Use a plant sprayer to distribute it well. Use a brush the loosen the dirt.
  • Leave the shampoo on for around 20 minutes.
  • Remove the shampoo and dirt with a brush and plenty of water by rinsing and brushing. Rinse thoroughly.
  • Leave the cloth to dry a little.

Is dirt still visible? Then continue cleaning with Power Cleaner. See step 2.



Remove all stains and heavy dirt with POWER CLEANER.

Power Cleaner

  • Apply Power Cleaner to dry boat cover. Use the spray or plant sprayer again. Then rub in with a soft brush.
  • Leave on for approximately 1 hour. Do you not see any change? Spray extra Power Cleaner, brush and leave it to work again. Repeat these steps until the spots are gone. This can sometimes take a few hours.
  • Rinse well afterwards.
  • Let the boat cover dry well.



Protect the fabric and make it waterproof with SPRAYHOOD & TENT PROTECTOR.

Sprayhood & Tent Protector

  • Apply Sprayhood & Tent Protector generously and evenly. Use a plant sprayer. Also use on the inside of the roof! This gives you better protection against mould and weather spots on the inside.
  • Do not allow Sprayhood & Tent Protector to dry on windows or varnish etc., but immediately remove with a damp cloth.
  • Let the roof dry well. Repeat the treatment as needed.
  • Are there any drops of impregnating agent left on the windows? Simply wipe with a little white gas.
  • Then clean the windows with Ultramar Sprayhood & Tent Shampoo.


Guaranteed result

At Ultramar, we clean and impregnate more than 2000 boat covers, umbrellas and tents in this way each year. Since 1998!

  • We use all the products ourselves for treating boat covers professionally.
  • The products are ready to use, so they can be used immediately.
  • Step-by-step plan and products have been developed with more than 20 years of practical experience.
  • Recommended for years by sailmakers, fabric manufacturers and water sports enthusiasts like you.

Why always clean and impregnate in 3 steps?

The dirt on your boat cover never consists of 1 type of dirt. It is sand, soot from exhaust gases, droppings from insects and birds, salt, lime etc. You can never remove that with 1 product. Therefore, always clean in 2 steps. That way, you can be sure that the fabric is perfectly clean. The impregnating agent then adheres much better to the cloth. And that in turn ensures that your boat cover stays clean and watertight for much longer.

How much do you need?

It is difficult to say exactly how much product you need. It always depends on the condition of the canvas, the size of the boat cover and how much dirt is on it. Read more


We receive these questions daily.

  • QUESTION: Do I have to impregnate the inside of my boat cover?

    ANSWER: Yes, the inside of the tent must also be impregnated. The coating on the inside is very delicate. With many boat covers, the coating on the inside of the fabric ensures watertightness. This coating is very susceptible to mould and weather stains.  

  • QUESTION: How often do I have to impregnate my boat cover?

    ANSWER: We recommend impregnating a boat cover immediately after purchase. This way, the coating gets a protective layer. After that, it is sufficient to impregnate the boat cover once or twice a year. In this way, the boat cover remains well protected.

  • QUESTION: How can I make the seams waterproof?

    ANSWER: Sprayhood & Tent Protector is very suitable for waterproofing the seams. Due to the large number of active substances, it is effective with poor stitching. You can fill in the holes by injecting the seams a number of times in succession.

  • QUESTION: Do I have to dilute the shampoo and impregnating agent?

    ANSWER: No, our products are ready to use. You thus know for sure that they will work perfectly.

  • QUESTION: Can it get on the transparent windows of my boat cover?

    ANSWER: It is not harmful if the shampoo, the Power Cleaner or the impregnating agent gets on the window film. Do you see dried drops of impregnating agent on the windows after impregnation? You can simply remove those with a cloth and a little white gas.


This is what others say about us! We are proud of that!

boat cover reviews


Want to order and receive Ultramar products easily at home?

  • Delivery time 1 to 2 business days
  • Free shipping for orders above 50.00
  • Receive at home or pick up at a parcel shop nearby.
  • Pay later? That is also possible with Ultramar!


  • COMING SOON - Plastic Window Cleaner & Protector 400 ml

    PREO ORDER NOW! - Plastic Window Cleaner & Protector restores clearness and shine to transparent plastic. In 1 quick, simple treatment. Removes dirt and makes small scratches less visible. Improves visibility in rainy weather. Protects against dirt, water

    € 24,99

  • Sprayhood & Tent Protector

    Sprayhood & Tent Protector is a very strong impregnating agent for your awning, boat cover or convertible top. It makes the fabric waterproof and provides added protection against any type of dirt. Does not need to be diluted. Dries colourless. Provides l

    € 18,99

  • Power Cleaner - 1 Litre

    Ultramar Power Cleaner is a super-strong fabric cleaner. For when nothing else helps. Removes heavy contamination and deeply absorbed stains from your boat cover, tent or convertible top. For best results, always clean first with Sprayhood & Tent Shampoo.

    € 17,99

  • Sprayhood & Tent Shampoo

    Sprayhood & Tent Shampoo is a strong fabric cleaner. It cleans your tent, boat cover or convertible top safely and thoroughly. Does not need to be diluted. Suitable for any outdoor fabric. For regular maintenance. For very soiled fabric use in combination

    € 15,99

  • Recommended Fine sprayer EX10 1L

    Fine sprayer EX10: with this sprayer, it is very easy to properly distribute cleaning or impregnating agent over large pieces of cloth.

    € 14,99

  • Specially recommended brush

    Ultramar Brush: this brush is strong enough to remove dirt. And at the same time, soft enough not to damage the canvas or sail.

    € 12,99

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Ultramar Products 8,8 / 10 - 1794 Reviews @ Feedback Company
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