Hull blacking and bitumen-based paints provide essential protection for steel and wooden boats, shielding them from corrosion, abrasion, and water ingress. Commonly used on narrowboats, barges, and other inland waterway vessels, these coatings create a durable waterproof barrier. Two-pack epoxy coatings such as Ballastic Epoxy offer superior longevity and chemical resistance but are more complex to apply, whilst bitumen paints such as Ballastic Black provide a cost-effective and easy-to-apply solution. Selecting the right product ensures long-term hull integrity and reduced maintenance requirements.
SML Paints have 20+ years of experience in the marine paints market. Over this time we have developed a comprehensive range of quality products, supporting our customers with advice and guidance to deliver a first-class result.
We have developed our Ballastic range of products which includes both bitumen and epoxy options. Our products have higher volume solids than comparable alternatives, providing a very cost-effective solution. Kits for 50ft, 65ft and 75 ft boats are also available
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Bitumen and hull blacking paints are specialized coatings designed to protect the submerged sections of boats and marine structures from corrosion, abrasion, and water ingress. They provide a waterproof barrier, preventing rust and extending the lifespan of vessels, particularly those operating in inland waterways.
Bitumen-based paints are traditional, single-component coatings. They offer a flexible, waterproof layer suitable for steel and wooden hulls.
Advantages include
Some limitations include
Two-pack epoxy paints consist of a resin and hardener that, when mixed, form a tough, chemically cured coating. Products like Ballastic Epoxy are designed for steel boats, offering superior corrosion resistance and adhesion.
Advantages include
Some limitations include
Choosing the right marine paint depends on various factors:
Below you will find a general overview of the steps to be considered when applying bitumen and hull blacking paint. You should always refer to the specific data sheets and guides that you can find on each of our product pages for more detailed information.
The FAQ's below are for general guidance only. For specific questions, please refer to the application guides on our product pages or give us call and we will answer any questions that you have.
Q. Can I apply epoxy paint over existing bitumen coatings?
A. Yes, provided that the existing coating is well rubbed back and its overall thickness does not exceed 100 microns. Epoxy coatings (which are hard and relatively inflexible) tend to crack off thick (relatively soft and flexible) single pack bitumen coatings. If switching from bitumen to epoxy, to ensure durability, it is best to strip back to bare metal as much as possible before applying an epoxy primer.
Q. What is the drying time for bitumen paint?
A. Bitumen hull blacking is touch-dry in approximately 3-6 hours, depending on weather conditions. It is advisable to wait 48 hours before relaunching the boat
Q. Are bitumen paints suitable for saltwater environments?
A. Bitumen paints are primarily designed for freshwater use, such as canals and rivers. They offer good waterproofing but lack the long-term durability for saltwater exposure. Epoxy-based coatings can be used in saltwater environments.
Q. Can I apply hull blacking paint myself?
A. Yes, both bitumen and epoxy hull blacking paints can be applied as DIY projects. However, proper surface preparation and correct application techniques are necessary to ensure durability.
Q. How do I prepare the hull before painting?
A. Proper surface preparation is crucial for good adhesion. The hull should be thoroughly cleaned to remove dirt, grease, and marine growth. Rust and loose material should be removed. The surface must be completely dry before application.
Q. How many coats of hull blacking paint should I apply?
A. For bitumen paints, at least two coats are recommended for adequate protection, with additional coats providing enhanced durability. For epoxy coatings, the required thickness depends on manufacturer specifications, but two or more coats are typically needed.
Q. How long will epoxy hull blacking last compared to bitumen?
A. Epoxy coatings can last up to 10 years with proper application and maintenance, whereas bitumen-based coatings generally require recoating every 2-3 years. The longevity of epoxy paints makes them more cost-effective in the long run.
Q. Can I apply bitumen or epoxy hull blacking in cold or damp conditions?
A. Application should be done in dry weather with temperatures above 5°C (41°F). Lower temperatures will slow drying and curing times
Q. Can I apply a topcoat over hull blacking for extra protection?
A. Bitumen paints should not be overcoated with standard topcoats, as they may not adhere well. It is a good idea to apply a topcoat over epoxy coatings to give additional UV protection.
Q. Can hull blacking prevent rust formation?
A. Yes, both bitumen and epoxy hull coatings create a waterproof barrier that helps prevent rust. However, if rust is already present, it must be removed before painting to ensure the best results.
Q. How do I know when my hull needs repainting?
A. Signs that your hull needs recoating include visible rust and flaking or peeling paint. By selecting the right hull blacking paint and following best application and maintenance practices, you can ensure long-lasting protection for your vessel.
