Top Coat Primer EWI-333, 20kg, Improves Adhesion, Limits Basecoat Absorption, Ensures Render Curing, Multiple Colours, for Insulation Systems

• ESSENTIAL PRIMER FOR SILICONE RENDERS: EWI-333 Top Coat Primer is specially formulated to enhance adhesion between the basecoat and any EWI Pro silicone render, ensuring a durable, even finish.
• REGULATES ABSORPTION & CURING: Limits the absorbency of the basecoat layer, allowing silicone renders to cure properly — ideal for warm weather conditions where extended working time is required.
• TINTED FOR COLOUR CONSISTENCY: Can be tinted to match the render colour, preventing basecoat bleed-through and helping achieve uniform, professional results across large wall areas.
• BREATHABLE, WATER-GLASS FORMULA: Based on potassium water glass and silicone resin dispersion, this primer strengthens the substrate while maintaining vapour permeability.
• ALL-SEASON APPLICATION: Recommended for both summer and cooler months — improves adhesion, workability, and finish quality year-round when used before applying any EWI Pro Silicone Render.

EWI Pro Top Coat Primer is designed to be used in conjunction with any of our silicone renders. There are several reasons for using the Top Coat Primer (EWI-333); firstly it aids adhesion between the render and the basecoat. Secondly it limits the absorption of the basecoat layer, ensuring the render cures properly - this is especially important during the summer months, giving the installer time to get a finish on the render. Finally the Top Coat Primer can be tinted in the same colour as the render being used, ensuring that there is no basecoat bleed through. The EWI Pro Top Coat Primer is based on potassium water glass and water dispersion of silicon resin and helps strengthen the substrate and limits its absorptive capacity without compromising its breathability. Our Top Coat Primer should always be used during the summer months because it gives the render applicator more time to get the required finish on the render, however even during the cooler months of the year the primer aids adhesion between basecoat and the silicone render so we do recommend using it all year around. The EWI Pro Top Coat Primer is applied on top of the basecoat reinforcement layer (typically EWI Pro's Premium Basecoat (EWI-225) or EPS Basecoat (EWI-220) and should be allowed to dry prior to applying one of the EWI Pro range of Silicone renders (e.g. Nano Drex Silicone Render, Premium Bio Silicone Render, Silicone Render or Silicone Silicate Render).