Benjamin Moore Insl-X Max Block Stain Blocking Primer - White

Benjamin Moore Insl-X Max Block Primer is the ultimate next-generation water-based primer, developed to deliver superior stain-blocking performance compared to traditional water-based options. Designed for both interior and exterior use, Insl-X Max Bloc offers powerful protection against even the most stubborn stains, while providing a low-VOC, eco-friendlier alternative to conventional alkyd-based primers. Perfect for sealing tannin stains from challenging woods like redwood and cedar, Max Bloc effectively blocks water stains, smoke damage, crayon, marker, lipstick, ballpoint pen marks, and more. It’s ideal for tackling tough household stains and odours, ensuring a cleaner, more uniform finish with excellent adhesion on both vertical and horizontal surfaces.

• Advanced stain-blocking for tannin and common household stains
• Fast drying – ready for topcoat in just 1 Hour
• Low-VOC water-based formula
• Providing excellent adhesion
• Suitable for a wide range of surfaces, both indoors and outdoors
• Mildew-resistant
• Easy cleanup with soap and water
• 1 Gallon covers up to 37m2

Surfaces to be painted must be clean, dry, and free of dirt, dust, grease, oil, soap, wax, scaling paint, water soluble materials and mildew.

• Remove any peeling or scaling paint and sand these areas to feather edges smooth with adjacent surfaces.
• Glossy areas should be dulled.
• Drywall surfaces must be free of sanding dust.
• Spot prime before and after filling nail holes, cracks, and other surface imperfections.
• New plaster or masonry surfaces must be allowed to cure (30 days) before applying base coat.
• Cured plaster should be hard, have a slight sheen and maximum pH of 10; soft, porous or powdery plaster indicates improper cure. Knife off any protrusions and prime plaster before and after applying patching compound.
• Remove any powder or loose particles.

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

• Stir product with a circular, lifting motion before you begin to paint.
• Max Block Water-Based Stain Blocking Primer may be applied by brush, roller, or spray, at a rate of application not to exceed 400 square feet per gallon. Surface texture and porosity will affect actual yield. Spray, Airless: Pressure / 1,500 – 3,000 PSI Tip / 0.013 – 0.017
• For best brush application results, use a quality synthetic filament brush.
• For roller application use a 3/8” nap cover for smooth surfaces, a 1/2“ nap cover for semi-rough surfaces, and a 3/4” nap cover for rough surfaces.
• Do not thin. Apply at full strength for maximum stain blocking and sealing properties.

Note: Max Block seals the stain and prevents it from bleeding through into the topcoat. In typical usage, difficult stains may not appear fully covered and sealed by the primer and the first finish coat. The second finish coat should provide complete coverage of the stained area. Two coats of primer may be required on severe stains. On hard, non-porous surfaces, such as glazed ceramics and non-ferrous metal, maximum adhesion and hardness may take 7 days to develop.

Always follow manufacturer's instructions found on the tin

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 on 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) - £6.99

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.