Grunt Emergel 500ml is a powerful marine-grade rust, stain, and oxidation remover designed to restore heavily weathered surfaces to a clean, like-new finish. Its thick gel formula clings to vertical and curved surfaces, allowing maximum contact time for effective cleaning without excessive scrubbing.

Ideal for removing rust stains, waterline marks, and oxidation, Emergel works across a wide range of materials including fibreglass, gelcoat, stainless steel, painted surfaces, and more.

Simply apply, leave for 5–15 minutes, and rinse off to reveal dramatically improved surfaces. This makes it an essential first step in restoring boats, trailers, and marine equipment.

Emergel is commonly used as Step 1 in a 3-stage restoration system, followed by oxidation removal (Klenashine) and protection (Supawax) for best results.

Key Features

• Heavy-duty rust, stain & oxidation remover
• Gel formula clings to vertical surfaces for better performance
• Removes waterline stains, rust streaks, and heavy weathering
• Works on fibreglass, gelcoat, stainless steel, enamel, and more
• Fast-acting – results in 5–15 minutes
• Minimal scrubbing required
• Suitable for boats, trailers, vehicles, and household surfaces
• NZ made product

Specifications

• Volume: 500ml
• Product Type: Rust, stain & oxidation remover
• Formula: Thick gel (non-drip)
• Application: Brush or cloth, rinse off after use
• Surfaces: Fibreglass, gelcoat, stainless steel, painted surfaces
• Use Case: Marine cleaning, restoration, maintenance

Why Choose Grunt Emergel? 

For New Zealand boat owners, rust staining and waterline buildup are constant issues due to saltwater exposure and harsh UV conditions. Emergel provides a fast, effective solution for restoring heavily stained surfaces without aggressive scrubbing.

It’s especially useful for:

• Waterline stain removal before polishing
• Rust streak removal on fibreglass and gelcoat
• Prepping surfaces before restoration or waxing

Using Emergel as the first step helps ensure better results from follow-up products, making it a key part of any boat maintenance routine.

Recommended System 

For best results, use the Grunt 3-step system:

1. Emergel → Removes rust & heavy staining
2. Grunt Klenashine Oxidation Remover → Restores faded surfaces
3. Grunt Supawax Polish → Protects and adds shine

This sequence dramatically improves results and increases product lifespan.