Sealant Guns

Our sealant guns are designed to give you precise control when applying sealant, caulk, adhesives and silicone. Whether you’re sealing gaps, filling joints or applying specialist construction products, a high-quality gun ensures a smooth, consistent bead every time.

What sealant guns are and how they support precise application

A sealant gun holds and dispenses a tube or foil of sealant by applying controlled pressure through a trigger mechanism. It allows the user to apply material evenly, with the correct bead size and predictable flow, making it far more professional and tidy than squeezing sealant by hand.

Sealant guns are suitable for use with silicone, acrylic fillers, polyurethane sealants, frame sealants, foils and standard cartridges.

Types of sealant guns: caulking guns, mastic guns and silicone guns

The market offers several types of sealant guns depending on the material and the application. Choosing the right tool ensures better control, reduced waste and a cleaner finish.

Manual caulking gun options

Caulking guns are the most common option, used for sealant, caulk and decorators’ fillers. They load easily, are lightweight and offer good control for general interior and exterior sealing tasks, including skirting boards, frames and internal gaps.

Heavy duty sealant guns for professional use

For tough materials like polyurethane sealants, fire mastics and thicker adhesives, a heavy duty mastic gun or silicone gun offers more power and stability. Brands such as OX Tools and Cox provide durable, long-lasting options that are designed specifically for trade users.

These guns are ideal for demanding site work where extra force is required to push bead material smoothly through the nozzle.

Understanding thrust ratio and why it matters

The thrust ratio determines how much force is applied to the cartridge when the trigger is pulled. A higher thrust ratio is essential for dispensing thicker, harder-to-pump materials, while lower ratios are suitable for standard silicones and decorators’ fillers.

Choosing the right thrust ratio helps ensure a consistent bead, reduces user fatigue and prevents splitting or jamming of the cartridges.

Sealant guns designed for demanding materials and thicker sealants

Some sealant guns are designed specifically for heavy, dense products such as PU sealants, construction adhesives and hybrid materials. These guns often include reinforced frames, metal push rods and improved leverage, allowing the user to apply sealants smoothly even in cold weather or on rough surfaces.

Foil-pack compatible guns additionally suit 400ml and 600ml foils, reducing packaging waste and offering better value per product.

Where sealant guns deliver the best application results on site

Sealant guns are widely used in construction, bathrooms, kitchens, glazing work and insulation installs. They excel on:

• Frame sealing around windows and doors.
• Filling movement joints and perimeter gaps.
• Dispensing adhesives for bonding trims and panels.
• Applying silicone in wet areas.
• Foam and fire-rated applications in exterior and interior projects.

With the correct sealant gun, the final finish is cleaner, smoother and more durable.

On this page you can find the right model for your task, compare price and VAT details, and add it to your basket when ready. All key items remain in stock for fast delivery across the UK.