Davis 792 FSR Big Job Fiberglass Stain Remover 2 Liter 68 oz.

A Stain-Absorbing Gel That Does the Heavy Lifting

Davis FSR is not a typical liquid cleaner. It is a thick, light blue gel that clings to vertical and curved fiberglass surfaces, giving the active ingredients time to absorb and lift stains rather than simply washing over them. This gel consistency is particularly useful when treating stubborn waterline stains, rust streaks from fittings, exhaust discolouration, and the grimy buildup that accumulates at the transom. The 2-litre bottle in the 792 Big Job format gives you plenty of product for full-season maintenance or for tackling a heavily stained hull after a long haul-out.

Safe on Gel-Coat and Painted Surfaces

One of the most important qualities of Davis FSR is what it does not do. Because the formula is non-abrasive, it will not scratch, dull, or cut into your gel-coat or white painted topsides the way abrasive compounds or aggressive scrubbing pads can. This makes it a practical choice for routine stain removal without the risk of creating swirl marks or thinning your gel-coat over time.

That said, Davis recommends testing a small, inconspicuous area first before applying FSR to any new surface. This is a sensible precaution with any cleaning product, particularly on older or previously repaired gel-coat where the finish may behave differently.

Simple Application, No Special Equipment Required

Using Davis FSR requires no specialised tools or equipment. Apply the gel directly to the stained area using a brush, sponge, or cloth. Allow it to sit for a few minutes so the formula can work into the stain, then wipe it away or rinse with water. There is no sanding, compounding, or buffing required after treatment, which keeps the job straightforward and accessible for boaters of all experience levels.

When working with FSR, wear protective gloves and eye protection as recommended in the product safety data sheet. Latex or nitrile rubber gloves are suitable. Avoid contact with eyes and skin, and wash hands thoroughly after handling.

Versatile Use Beyond the Waterline

While Davis FSR is well suited to marine applications, its usefulness extends beyond the boat itself. It can be used on any fiberglass surface where staining is a problem, including onboard shower stalls and fiberglass furniture. For boaters who trailer their vessels, FSR is also effective at removing road soil, grime, and road film that accumulates on the hull and hull sides during transport.

This versatility makes the 2-litre Big Job bottle a practical investment for anyone who maintains multiple fiberglass surfaces or wants a single product that handles a range of cleaning tasks.

Where Davis FSR Works Best

Davis FSR is designed for use on fiberglass surfaces and is particularly effective on the following types of staining:

• Waterline stains caused by algae, minerals, and organic matter
• Rust stains from stainless steel fittings, anchors, or chain
• Exhaust staining on transoms and hull sides
• Oil and fuel residue on deck and hull surfaces
• Road soil and grime on trailered boats and recreational vehicles
• General fiberglass staining on shower stalls and onboard furniture

Specifications

• Part Number: 792
• Volume: 2 litres (68 oz. / 0.53 gallons)
• Physical State: Liquid gel
• Appearance: Light blue gel
• Odour: Odourless
• Chemical Family: Water-based cleaner with viscosity booster
• Formula: Proprietary
• pH: 5
• Specific Gravity (H2O): 1.10
• Boiling Point: 180°F
• Vapour Pressure: <90 mm @ 100°
• Evaporation Rate (H2O): <1
• Solubility in Water: Complete
• Isopropanol Content (CAS# 67-63-0): 4.5%
• Oxalic Acid Content (CAS# 144-32-7): 4.5%
• Non-toxic Ingredients: 91%
• Flammability (HMIS): 0
• Health Rating (HMIS): 1
• Physical Hazard (HMIS): 0
• Flash Point: None to boiling (TCC)
• Stability: Stable
• Incompatibility: Oxidising agents
• Transport Classification: Not regulated
• Hazardous Waste Classification: Not a RCRA hazardous waste

Key Features 

• Absorbs and lifts stains: gel consistency clings to surfaces for more effective stain removal than liquid cleaners
• Non-abrasive formula: safe for use on gel-coat and white painted surfaces without scratching or dulling the finish
• No sanding or compounding required: simplifies the cleaning process and reduces the risk of surface damage
• Tackles a wide range of stains: effective on oil, rust, exhaust, waterline, transom, and road soil
• Versatile beyond the hull: suitable for fiberglass shower stalls, onboard furniture, and trailered recreational vehicles
• Easy application: apply with a brush, sponge, or cloth, wait a few minutes, then wipe or rinse off
• Large 2-litre format: provides ample product for full-season maintenance or heavily stained surfaces
• Mildly acidic pH: effective against mineral and rust-based staining without aggressive corrosive action
• Water-based formulation: complete water solubility supports straightforward rinse-off cleanup