# Thompsons Damp Seal – Stain Block Paint

Thompsons Damp Seal Stain Block is a high-performance sealant designed to prevent damp and stains from penetrating walls. This 750ML solution is ideal for treating damp patches and stains, providing a reliable barrier before painting. Perfect for use in both residential and commercial settings, it helps ensure a clean, professional finish by blocking out moisture and stains.   
  
**Benefits:**

-   Effective at blocking damp and stains
-   Provides a reliable barrier before painting
-   Suitable for both residential and commercial use
-   Fast-drying formula for quick application
-   Can be painted over with most finishes
-   Helps achieve a clean, professional finish

## Details

- **Price:** 9.63 GBP - 54.08 GBP
- **Vendor:** RONSEAL LTD (G47F)
- **Type:** Primers & Specialist Paints
- **Tags:** Decorating, National, Paints, Primers & Specialist Paints

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| 250ml | 9.63 GBP | In stock |
| 750ml | 19.53 GBP | In stock |
| 2.5L | 54.08 GBP | In stock |

## Images

- Thompsons Damp Seal – Stain Block Paint
- Thompsons Damp Seal – Stain Block Paint
- Thompsons Damp Seal – Stain Block Paint

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> Source: [Carvers Building Supplies](https://www.carvers.co.uk/products/thompsons-damp-seal-stain-block-750ml-30323)
> Updated: 2026-06-20