Johnstone’s Trade Stormshield Aqua Guard Primer Undercoat – Brilliant White - 2.5L

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Johnstone’s Trade Stormshield Aqua Guard Primer Undercoat is a high-performance, water-based undercoat specially formulated for exterior wood. It provides outstanding adhesion, excellent opacity, and blocks staining from bare timber by preventing resin bleed-through. Designed as the ideal foundation for Stormsheild Aqua Guard Gloss, Satin, and Matt topcoats, it ensures a uniform, long-lasting finish with superior durability for outdoor applications.

• Blocks resin bleed-through on bare timber
• Excellent adhesion to previously painted and porous surfaces
• High opacity for a smooth, even finish

Designed for use with Stormshield Aqua Guard Exterior Gloss or Satin

Ensure the surface is clean, dry and free from dirt and grease.

• Remove any loose or flaking material
• For maximum performance from this microporous product, completely remove old paint and varnish. Treat any mould or lichen with sterilisation wash as directed. Treat bare wood surfaces with a suitable clear wood preservative.
• For bare timber, apply one coat of Johnstone's Trade Stormshield Aqua Guard Exterior Primer Undercoat followed by two coats of Johnstone's Trade Stormshield Aqua Guard Exterior Gloss or Satin.
• Prime bare metal with an appropriate metal primer.
• Rub down previously gloss painted surfaces with fine waterproof abrasive paper and rinse thoroughly before applying a pre-coat of Johnstone’s Trade Stormshield Aqua Guard Exterior Primer Undercoat.
• Uncoated plastic rainwater products should be cleaned thoroughly, primed with a single coat of Johnstone’s Trade Advanced Multi Surface Primer and given two coats of Johnstone’s Trade Stormshield Aqua Guard Exterior Satin or Gloss.

Always test a small area of the surface to be painted to ensure you are happy with the finished results

• Stir thoroughly before use to ensure the paint is completely mixed.
• Stormshield Aqua Guard Exterior Primer Undercoat can be applied by brush, roller or sprayer. For best results use a synthetic brush. Avoid overspreading
• 2 coats are recommended on highly resinous surfaces.
• Sprayer application: HVLP application: 1.8-2.0mm tip size. Spray pressure: 0,3-0,4 MPa (= approx. 3-4 bar). Can be diluted 5-10% Airless spray application: 0.008"-0.010". 2000–2500psi. Undiluted. Must use Ultra Finish tips.
• Ensure good ventilation during application and drying.
• If using more than one can of the same colour, intermix prior to use to ensure colour consistency.
• Do not apply in temperatures below 8°C or externally when rain is imminent.
• Additional coats may be required with certain colours, or attempting a wide colour change.

Always follow manufacturer's instructions found on the tin

Note: To ensure the paint system achieves its life expectancy the product must be applied in accordance with a project specific Johnstone’s Trade Technical Specification and BS 6150:2019, Code of Practice for Painting Buildings.

Delivery - All orders placed on a working day before 3pm will be dispatched on the same day for next working day delivery. Orders placed before 3pm on Friday will be delivered on Monday (excluding bank holidays). Orders placed after 3pm on Friday, weekends and Bank Holidays will be dispatched on the next working day. 

Delivery of Tinted Products - Tinted paints are dispatched in line with our express order process, shown below. However, due to their bespoke nature, please allow up to an additional 5 working days to accommodate any potential courier delays or delivery issues before receiving a refund or replacement.

We strongly suggest customers avoid booking tradespeople until they receive their order. Next Day Paint will not be held liable for any costs incurred due to order processing errors, delivery delays, or other issues that may result in financial loss.

Delivery Options

Express Shipping - £3.99

Order by: 3pm, Monday - Sunday

Expected delivery: Next working day, 8am - 9pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

AM Delivery - £12.99

Order by: 2pm, Monday - Sunday

Expected delivery: Next working day by 2pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following AM

Late Cut-Off - £5.99

Order by: 4pm, Monday - Friday 

Expected delivery: Next working day, 8am - 9pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

Saturday Delivery - £9.95

Order by: 2pm, Friday 

Expected delivery: Saturday, 8am - 9pm

Standard Delivery (Out of Zone Postcodes Only) - £8.99

Order by: 3pm, Monday - Sunday 

Expected delivery:  3-5  working days, 8am - 9pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

We do not deliver to the Channel Islands or the Republic of Ireland

Certain postcodes delivery times and charges may vary please head to the cart to see your available delivery options.

Returns

We offer a 14 day money back guarantee for all goods shipped correctly that are not required. If the item is not required, please send the item back for a full refund in its original condition, unused with its original packaging. Please note return for unwanted item is at your own expense.

Contact us as soon as possible to inform us you will be returning the product either by a contact form or by calling our team on 0161 960 0217.

All tinted paint purchases are final and non-refundable. If you're unsure about your selection, please refer to the product listing or contact us for guidance before ordering. Once mixed, tinted paints cannot be returned or refunded, regardless of delivery delays or changes in circumstances.

While we aim to meet delivery timelines, we are not responsible for delays caused by couriers, weather, or other external factors.

We recommend ordering samples or colour charts before purchasing. While we strive to represent colours accurately, screen settings and surface types can affect appearance. Opened tins cannot be returned due to dissatisfaction with colour.

For non-tinted products, we offer a 14-day money-back guarantee. Items must be returned unused, in original condition and packaging, at your own expense.

Damaged Paint

Please visit our damages page, where we can help resolve the issue for you. 

Incorrect Item

If we have sent you a different item from what you ordered, we will be happy to organise an exchange for the correct goods at no extra charge to yourself, please get in touch to organise this.

Faulty Items

Faulty items can be refunded or exchanged within 30 days. All returns are tested, and if no fault is found, no refund will be issued you'll have the option to have the item returned. For faults discovered after 30 days, please contact the manufacturer for further support.