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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Description

⚓ Build stronger, last longer — the marine epoxy pros trust!

EXTENDED WORKING TIME - Slow hardener offers 20-minute pot life for meticulous, flawless application.
PRECISION 5 1 MIXING RATIO - Color-coded pumps ensure perfect resin-to-hardener balance every time.
UNMATCHED MARINE GRADE STRENGTH - Achieve 7500 PSI tensile strength for durable, long-lasting repairs.
VERSATILE MULTI SURFACE BONDING - Bonds wood, steel, aluminum, fiberglass, carbon fiber & more with ease.
WEATHERPROOF CHEMICAL RESISTANT - Cured epoxy withstands salt, moisture, abrasion, and solvents for ultimate protection.

TotalBoat 5:1 Epoxy Kit is a premium marine-grade epoxy resin system designed for high-strength bonding, coating, and laminating across multiple materials including wood, metals, and composites. Featuring a precise 5:1 resin-to-hardener ratio with color-coded pumps, it offers a 20-minute pot life with slow hardener and cures to a durable, waterproof finish resistant to chemicals, salt, and abrasion. Ideal for boat building, repairs, and advanced composite projects, this kit delivers professional-grade results with versatile application options.

Specifications

Brand	TotalBoat
Specific Uses For Product	Repair, Fiberglass projects
Material	Epoxy Resin
Item Form	Liquid
Special Feature	Strong
Colour	Clear (cures to amber)
Item Package Quantity	1
Package Information	Can, Syringe
Item Volume	946.35 Millilitres
Viscosity	700
Full Cure Time	7 Days
Water Resistance Level	Waterproof
Tensile Strength	7500 PSI
Net Quantity	1.0 count
UPC	811932021014
Global Trade Identification Number	00811932021014
Manufacturer	TotalBoat
Model number	365646
Number of Memory Sticks	1
Item Weight	2 kg 720 g
Package Dimensions	31.29 x 23.59 x 16 cm; 2.72 kg
Item model number	365646
Included Components	Resin, Hardener
Are batteries included?	No

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