Topcoat paints provide the final protective layer, enhancing durability, aesthetics, and resistance to environmental conditions. They are available in a much wider range of colours compared to primers. Topcoats come in single pack and 2-pack versions. Single pack topcoats are ready to use, easier to apply and cost effective but are less durable than 2-pack products. Single-pack topcoats are typically acrylic which are UV-resistant and fast-drying or alkyd which are oil based and slightly more durable. When selecting a topcoat, consider surface type, environmental exposure, durability requirements, finish preference, application method, and drying time. Choosing the right topcoat ensures long-lasting protection and visual appeal.
SML Paints have 20+ years of experience in the specialist paints market. Over this time we have developed a comprehensive range of quality products, providing our customers with advice and guidance to deliver a first-class result.
We stock a wide range of single pack topcoats available for same or next-day dispatch. As well as topcoats from leading paint brand Jotun, we have developed our own SML Lustre topcoats that provide a quality finish in a huge range of colours offering real value for money.
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Selecting the right topcoat depends on several factors:
Proper application ensures durability and performance. Please refer to product application guides for detailed information on specific products
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. What is a topcoat, and why is it important?
A. A topcoat is a protective layer applied over a base coat or primer to give UV resistance to the primer and enhance durability, appearance, and resistance to wear, moisture, and chemicals. It helps extend the lifespan of a surface and improves its finish.
Q. How many coats of topcoat should I apply?
A. Generally, one or two coats are recommended for the best durability and even coverage. Multiple thin layers work better than thick coats, and light sanding between coats can improve adhesion and overall finish.
Q. What is the difference between single-pack and 2-pack topcoats?
A. Single-pack paints are ready to use, air-dry, and are easier to apply, but they are less durable. Two-pack paints require mixing with a hardener, chemically cure, and are much tougher and more resistant to chemicals, abrasion, and UV exposure.
Q. How long does a topcoat take to dry and fully cure?
A. Single-pack paints usually dry within one to four hours and fully cure in seven to fourteen days. Two-pack paints may dry in thirty minutes to a few hours, but full curing can take several days to weeks, depending on the product and conditions.
Q. Can I apply a topcoat directly over old paint, or do I need a primer/tie coat?
A. It depends on the condition and type of the old paint. If the old paint is in good condition and compatible, you can apply a topcoat after light sanding. If the surface is glossy, peeling, or a different type of paint, use a tie coat or primer to ensure proper adhesion.
Q. Do I need to sand between coats of topcoat?
A. Not necessarily, but light sanding with fine-grit sandpaper (240-320 grit) between coats helps with adhesion and smooths out imperfections. However, follow manufacturer guidelines, as some topcoats don’t require sanding between layers.
Q. What’s the best way to apply a topcoat—brush, roller, or spray?
A. A brush is good for small areas and detailed work but may leave brush marks. A roller works well for large flat surfaces but can create slight texture. A spray provides the smoothest and most even finish but requires suitable equipment and ventilation.
Q. How do I prevent bubbles, streaks, or brush marks in a topcoat?
A. Apply thin, even layers. Use high-quality brushes, rollers, or a spray gun. Avoid overworking the paint. Apply within specified temperature and humidity levels as specified in the application guide. Lightly sand between coats if necessary.
Q. Can a topcoat be used for waterproofing?
A. Some topcoats provide water resistance, but for full waterproofing, it's best to use products specifically designed for marine or outdoor use, such as epoxy or polyurethane coatings.
Q. How do I fix issues like peeling or flaking topcoat?
A. First, identify the cause, which could be poor adhesion, moisture, or surface contamination. Sand down the affected area and remove loose paint. Apply a primer or tie coat if needed, then reapply the topcoat in thin, even layers.
