Prepare & Clean Roof Surfaces: Easy Cleaning with Pressure Washer & Pump Sprayer
Cleaning is the most important part of any roof coating project. Our roof cleaners are made for easy cleaning, breaking down moss, lichen, algae, grease and loose debris. This leaves a clean, stable base for primers and paints to apply properly. Many DIY users and professionals use a pressure washer or pump sprayer to speed up the process, followed by a good rinse. Depending on the roof type, products like fungicidal washes, mild acids, or even bleach-free options are used to kill spores without affecting nearby pets or children. Removing dirt and biological growth before painting improves adhesion and prevents problems like bubbling or trapped moisture. Whether you're sealing garage roofs or commercial projects, starting with the right cleaning method makes all the difference.
Why Combine Primer + Paint + Cleaner for a Waterproof Coating?
Using a roof cleaner first, then applying a compatible primer, followed by a durable roof paint, provides a full coating system that performs well on most substrates. A good primer binds the paint to the surface, while the cleaner ensures no organic matter or residue is left behind. This is especially true for older roof types, where issues like dust, moss, or damp patches are common. Even if you're using a high-tech system like Liquid Rubber or flexible waterproofing coatings, a primer layer often increases compatibility, adhesion and total life expectancy of the product. This approach is widely used across domestic and commercial projects because it reduces leaks, prevents early corrosion, and provides an ideal solution for protecting both flat and pitched roofs.
Roof Paint & Primer Range Suitable for All Surfaces
Our product range includes coating systems to match different roof materials and surfaces, with options that are suitable for concrete, asbestos, felt and metal. Each job benefits from surface-specific cleaning, priming and painting steps. Here are a few examples:
- Corrugated Asbestos Sheets need encapsulating coatings that isolate fibres—see our Corrugated Asbestos Sheets product range
- Flat roofs prone to pooling water benefit from Flat Roof Waterproofing Paint and Flat Roof Primers that form flexible membranes
- Guttering and roof edges can be treated with Gutter Repair Paint to seal cracks and small leaks
- For emergency fixes or patchwork application, use Instant Roof Repair Paint for quick coverage
Every system comes with accessories where needed, such as a brush, pump sprayer, or equipment for easy application. Proper preparation and cleaning of surfaces leads to better long-term results and avoids unnecessary rework or damage.
Make the Right Choice — Contact Us or Buy Online
With so many products, choosing the right roof paint, primer or cleaner can feel like a lot to sort through. Our technical support team has decades of experience in roofing projects and are available to give tailored advice on surface type, product usage, and application techniques. From garage roofs to larger industrial structures, we’ve tested everything we sell to offer only the most reliable options. Browse the product categories above and place your order online for fast UK delivery. Or contact our team directly for help with your specific roof needs.
Frequently Asked Questions (FAQs)
Q: What chemicals do professional roof cleaners use?
A: They often use alkaline cleaners, mild acid formulas, or fungicides such as sodium hypochlorite or biocidal washes. These break down moss, algae and other organic growth, making surfaces ready for priming and painting. Most cleaners are safe when used correctly and won’t harm plants, pets, or lead surfaces.
Q: What to clean a roof with before painting?
A: Use a roof cleaner or biocide to kill algae and spores. A pressure washer or pump sprayer helps speed up cleaning, especially for large areas. Rinse thoroughly and allow the roof to fully dry before applying any primer or paint.
Q: Does roof paint need a primer?
A: Yes, in most cases. A primer ensures that the paint bonds properly to older or porous substrates, including concrete, felt or metal. Some newer paint systems can go direct to surface, but a primer often improves adhesion and durability—especially for long-term waterproofing.
Q: Does Wet & Forget really work on roofs?
A: Wet & Forget and similar cleaners can help control algae and moss growth over time, but they don’t replace a full cleaning, priming and painting system. For lasting results, combine a proper roof cleaner, suitable primer, and waterproof coating for full protection against leaks and weather exposure.