Brush Poolcoat Application Guidelines

Poolcoats are a critical part of the fibre-reinforced composite swimming pools materials as they enhance both the performance and the appearance of the finished composite. However, product quality and consistency alone cannot guarantee trouble-free production for the composite manufacturer.

The following are guidelines to assist the customer achieve the best results with our range of brush poolcoats.

Substrate Preparation

• Ensure that all surface coats and barriercoats are removed by coarse rotary machine abrasion.

• Flatten out the surface by filling any deep gouges or surface irregularities using NCS 52 PAS Bonding Paste, mixed with Butanox M50 at 1,5%.

• The substrate surface must be clean and dry before the application of Atprime 2.

Material Preparation

Atprime 2 should be mixed according to the data sheet (4:1) and applied at a rate of approximately 200gm  by brush or short pile mohair roller.

• Atprime 2 should be laminated over once cured but, but no longer than 24 hours.

• Lamination over the primed surface will be done using glass (ECR) tissue in conjunction with NCS 991 PA MV resin. In order to achieve the minimum resin content of 90% in the tissue at least 250g of resin will need to be laminated into the tissue per m . Ensure that the minimum catalyst level of 1,5% (25 C and above) and 2% (25 C and below) is added to the resin and stirred in prior to laminating. It is essential to achieve good cure in this thin laminate.

• Prior to the application of the Poolcoat ensure that it has been gently mixed.

• Allow the Poolcoat to stand for 10-15 minutes.

• Ensure that the Poolcoat is between 18-23 C. Poolcoat should not be applied below 15 C.

Poolcoat weighing and catalyst addition

• Ensure the weighing area is clean and free of contaminants.

• Wearing the appropriate protective clothing, accurately weigh out the required amount of poolcoat into a clean container.

• Add the correct amount of Butanox M50 catalyst (between 1 – 2.5% depending on the ambient temperature) and mix thoroughly with a clean mixing apparatus to ensure even distribution through the Poolcoat.

Poolcoat Application

• Avoid applying the Poolcoat onto a hot surface when the ambient temperature is high.

• Avoid excessive thickness and runs where possible as this will lead to slumping or sagging.

• Brush the poolcoat as evenly as possible to ensure a uniform looking final coating.

• Good, brisk brush strokes improve the air release in a gelcoat. The air release additive used in brush poolcoats relies on shear to work.

• Minimise drips and runs wherever possible (by applying at correct film thickness).

• Avoid very thin applications (<300μm) as this will lead to poor cure.

• Use a wet film thickness gauge to measure the Poolcoat thickness during application. The recommended thickness is 600 – 800 microns.

• The film must not be disturbed once cure has begun. The cure time will depend on catalyst level and temperature during application.


The information herein is to assist customers in determining whether our products are suitable for their applications. Our products are intended for sale to industrial and commercial customers. We request that customers inspect and test our products before use and satisfy themselves as to contents and suitability. Nothing herein shall constitute any other warranty expressed or implied, including any warranty of merchantability or fitness, nor is protection from any law or patent to be inferred. All patent rights are reserved. The exclusive remedy for all proven claims is replacement of our materials, and in no event shall we be liable for special, incidental, or consequential damages. Ou standard conditions of contract will apply to all sales.

Start typing and press Enter to search