Is this polyester resin

No it is not polyester resin. It is epoxy with a 5 to 1 ratio, and cures extremely hard. Polyester should not be used on a repair below the water line. Epoxy will not allow water to absorb into the repaired area.

can I use this to fix lamination on my RV side walls

Worked great for me rebuilding the wall sandwich (fiberglass, thin ply, foam board,,,) after water delamination.

Can you do inside of bathtub with this?

Good Afternoon, this product cures to a high strength, water resistant finish, so using within a bathtub should be fine. Thank you.

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TotalBoat 5:1 Marine Epoxy Resin Kit for Bonding, Filleting, Coating, and Laminating - Use for Fiberglass, Wood, Carbon Fiber, Boat Building, Repairs, Woodworking (Gallon, Slow Hardener, Pumps)

Product ID: 13247904

Details

Brand
TotalBoat
Item Form
Liquid
Material
Epoxy Resin
Special Feature
[Versatility
Specific Uses For Product
Boat building

⏳20 min pot life (slow hardener)

🧪5:1 resin-to-hardener ratio

🛥️7500 PSI tensile strength

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€ 361.29

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Build, Bond, and Repair Like a Pro—Don’t Get Left Ashore!

PRO LEVEL FINISH - Cures to a sandable, paintable solid that resists abrasion, impact, and solvents—professional results guaranteed.
CUSTOMIZABLE CURE TIMES - Choose slow or fast hardener to optimize working time and cure speed based on your environment.
MARINE GRADE DURABILITY - Engineered to withstand salt, moisture, and harsh weather for long-lasting repairs.
PRECISION MIXING SYSTEM - Color-coded pumps ensure perfect 5:1 resin-to-hardener ratio every time—no guesswork.
VERSATILE COMPATIBILITY - Bonds wood, metal, fiberglass, carbon fiber, and composites for multi-project flexibility.

TotalBoat Traditional 5:1 Epoxy Resin is a high-strength, marine-grade epoxy system designed for bonding, coating, and laminating in demanding environments. With a tensile strength of 7500 PSI and a precise 5:1 resin-to-hardener ratio, it offers superior durability and versatility across wood, metal, fiberglass, and composites. Available with slow or fast hardeners, this epoxy cures to a sandable, paintable finish that resists moisture, salt, and chemicals—ideal for boat building, repairs, and industrial composite projects.

Specifications

ASIN	B00HR8515C
Brand Name	TotalBoat
Color	Clear Amber
Compatible Material	Concrete, Fiberglass, Glass, Masonry, Metal, Stone, Wood
Container Type	Bottle
Customer Reviews	4.5 4.5 out of 5 stars (1,767)
Full Cure Time	24 Hours
Global Trade Identification Number	00811932021021
Included Components	Resin, Hardener
Item Form	Liquid
Item Package Quantity	1
Manufacturer	TotalBoat
Material Type	Epoxy Resin
Model	TB-521KITSB-K
Other Special Features of the Product	[Versatility, Two hardener speeds, Compatibility with TotalBoat 5:1 Epoxy Resin Systems]
Part Number	TB-521KITSB-K
Specific Uses For Product	Boat building, Repair
Tensile Strength	7500 Pounds Per Square Inch
UPC	811932021021
Unit Count	152.0 Fluid Ounces
Viscosity Level	Low
Volume	739 Milliliters
Water Resistance Level	Waterproof

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