--- product_id: 44092207 title: "Underdog Antifouling Bottom Paint - Red Gallon | Single-Season Ablative Paint; Use on Fiberglass, Wood, and Steel Hulls; Ideal for Trailered Boats; 24% Copper Biocide" brand: "totalboat" price: "¥71178" currency: JPY in_stock: true reviews_count: 8 category: "Total Boat" url: https://www.desertcart.jp/products/44092207-underdog-antifouling-bottom-paint-red-gallon-single-season-ablative-paint store_origin: JP region: Japan --- # Compatible with fiberglass, wood, steel & iron Single-season copper biocide protection 500 sq ft coverage per gallon Underdog Antifouling Bottom Paint - Red Gallon | Single-Season Ablative Paint; Use on Fiberglass, Wood, and Steel Hulls; Ideal for Trailered Boats; 24% Copper Biocide **Brand:** totalboat **Price:** ¥71178 **Availability:** ✅ In Stock ## Summary > 🛥️ Keep your hull sleek and barnacle-free—because your boat deserves the best! ## Quick Answers - **What is this?** Underdog Antifouling Bottom Paint - Red Gallon | Single-Season Ablative Paint; Use on Fiberglass, Wood, and Steel Hulls; Ideal for Trailered Boats; 24% Copper Biocide by totalboat - **How much does it cost?** ¥71178 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/44092207-underdog-antifouling-bottom-paint-red-gallon-single-season-ablative-paint) ## Best For - totalboat enthusiasts ## Why This Product - Trusted totalboat brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Rugged Durability:** Withstands trailering, beaching & daily wear without chipping - • **Smooth Sailing Prep:** Ablative formula wears evenly—no paint buildup, less sanding next season - • **Easy Pro Application:** Brush, roller, or spray with optional thinning for flawless coverage - • **Universal Compatibility:** Perfect for fiberglass, wood, steel, and iron hulls—one paint, many boats - • **Effortless Marine Defense:** Copper biocide actively prevents barnacles & mussels all season long ## Overview TotalBoat Underdog is a high-performance, economical antifouling bottom paint designed for fiberglass, wood, steel, and iron boats. Offering 500 sq ft coverage per gallon, it uses copper biocide to prevent marine growth for a full season. Its ablative formula ensures no paint buildup, making maintenance easier year after year. Durable enough to handle trailering and beaching, it applies easily with brush, roller, or spray. Made in the USA, it’s the smart choice for frequent boaters seeking reliable protection and value. ## Description TotalBoat Underdog marine bottom paint is an affordable way to keep barnacles, mussels and other clinging marine fouling pests off the bottom of your boat for a full season. Its ablative action wears away gradually as your boat moves through the water to ensure there's always a fresh layer of biocide to combat marine growth. As it wears away over the season, there’s no paint build-up, so you’ll have less sanding to do next season before applying a new coat. It’s also very durable, and can take the bumps and scrapes from trailering, beaching, and normal wear-and-tear all season long. It's ideal for use on sailboats, power boats, work boats and fishing boats, and is an excellent value for short-season boaters who use their boats on a regular basis. Underdog sticks to properly prepared substrates, and is an ideal for fiberglass, wood, bare steel, and iron boats. It’s also compatible with most previously applied bottom paints. Underdog is easy to apply by brush, roller, or spray equipment, and can be thinned for improved flow, up to 10%, with TotalBoat Special Brushing Thinner 100 (brush/roller application), or TotalBoat Spray Thinner 101 (spray application).Compare this bottom paint to Pettit Unepoxy HRT, Rustoleum Boat Bottom Paint, US Marine Products Coastal Copper 250, Blue Water Marine Paint Copper Shield 25, and Interlux Fiberglass Bottomkote NT. Underdog is a marine paint intended for antifouling use on boats, applied to hulls and boat bottoms below the waterline only. It is not intended for household use. All TotalBoat marine products provide great value and great results. 100% made in the USA. Review: Antifoul paint - Great product Review: Cans came damaged with no handles except for 1 can - Purchased 3 cans. They came in 1 box, 1 box that was beat and falling apart. Cans came dented and only 1 can had a handle the other 2 handles were non existent. The one can was dented so bad I don’t know how it didn’t have a hole in it. Seller needs to ship these heavy items better or someone is going to have a mess when it gets delivered to them. Product itself was fine. ## Features - ECONOMICAL ANTIFOULING BOTTOM PAINT provides excellent single-season protection; copper biocide keeps barnacles and mussels from clinging to hull bottoms; ideal for sailboats, power boats, fishing and work boats in all types of saltwater conditions - EFFECTIVE MARINE PAINT prevents barnacles from attaching to your hull by releasing fresh biocide as water moves under the boat; best for boats used frequently; durable finish withstands trailering & beaching better than traditional ablative paints - FOR USE ON PROPERLY PREPARED FIBERGLASS, WOOD, STEEL, AND IRON BOAT BOTTOMS; because the ablative coating wears away during the season, there's no paint buildup, which makes your bottom paint job easier next season - EASY TO APPLY: Use a natural bristle brush, or a 3/16” nap or foam solvent-safe roller, or use airless or conventional spray equipment. THINNING (10%): brush/roller - TotalBoat Special Brushing Thinner 100; spray equipment - TotalBoat Spray Thinner 101 - AVAILABLE IN GALLON SIZE IN BLACK, BLUE AND RED COLORS. Coverage: 500 sq ft per gallon; this product is a marine paint intended for antifouling use on boats, applied to hulls and boat bottoms below the waterline only; it is not intended for household use ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00HS5EFO2 | | Age Range Description | Adult | | Best Sellers Rank | #25,573 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #79 in Boat Hardware | | Brand | TotalBoat | | Brand Name | TotalBoat | | Color | Red | | Color Code | FF0000 | | Container Type | Can | | Coverage | 500 | | Customer Reviews | 3.6 out of 5 stars 600 Reviews | | Dry Time In Hours | 16 | | Finish Type | Flat | | Full Cure Time | 16 Hours | | Global Trade Identification Number | 00811932020369 | | Included Components | Paint | | Indoor Outdoor Usage | Outdoor | | Is Waterproof | True | | Item Form | Liquid | | Item Volume | 1 Gallons | | Manufacturer | TotalBoat | | Model Number | 365430 | | Paint Type | solvent-based | | Part Number | 365430 | | Size | 128 Fl Oz (Pack of 1) | | Surface Recommendation | Fiberglass, Wood, Steel, Iron | | UPC | 811932020369 | | Unit Count | 128.0 Fluid Ounces | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** TotalBoat - **Color:** Red - **Finish Type:** Flat - **Indoor/Outdoor Usage:** Outdoor - **Item Form:** Liquid - **Item Volume:** 1 Gallons - **Paint Type:** solvent-based - **Size:** 128 Fl Oz (Pack of 1) - **Surface Recommendation:** Fiberglass, Wood, Steel, Iron - **Unit Count:** 128.0 Fluid Ounces ## Images ![Underdog Antifouling Bottom Paint - Red Gallon | Single-Season Ablative Paint; Use on Fiberglass, Wood, and Steel Hulls; Ideal for Trailered Boats; 24% Copper Biocide - Image 1](https://m.media-amazon.com/images/I/710Y0P9lcgL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Antifoul paint *by C***. on May 13, 2026* Great product ### ⭐ Cans came damaged with no handles except for 1 can *by M***D on May 25, 2026* Purchased 3 cans. They came in 1 box, 1 box that was beat and falling apart. Cans came dented and only 1 can had a handle the other 2 handles were non existent. The one can was dented so bad I don’t know how it didn’t have a hole in it. Seller needs to ship these heavy items better or someone is going to have a mess when it gets delivered to them. Product itself was fine. ### ⭐⭐⭐⭐⭐ Amazing Product Well Exceeded My Expectations! *by J***R on May 30, 2017* Simply amazing!!! Totally exceeded my expectations. I opened the box and they included for free: a complete roller, tray, gloves, body suit, dust mast, and mixing sticks. All free!!!! I have been bottom painting my own boats for over 20 years and this paint was the best value for the price. It came well mixed and applied very well. My boat has been in the slip for almost 3 weeks now and there is still no single salt line or growth starting yet. For this product I paid $82 plus shipping and again all inclusive with supply materials. Previously at rip off West Marine I would pay $129.99 and still have to buy all the support materials. If you are reading this please trust me I have been doing my own boat maintenance for over 20 years and have learned a lot over the way, many many mistakes included. This product is awesome you will be very pleased! ## Frequently Bought Together - TotalBoat Underdog Marine Antifouling Bottom Paint for Fiberglass, Wood and Steel Boats (Red, Gallon) - TotalBoat Wet Edge Marine Topside Paint for Boats, Fiberglass, and Wood (White), 1 Gallon (Pack of 1)(Packaging May vary) - TotalBoat Special Brushing Thinner 100 (Quart) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/44092207-underdog-antifouling-bottom-paint-red-gallon-single-season-ablative-paint](https://www.desertcart.jp/products/44092207-underdog-antifouling-bottom-paint-red-gallon-single-season-ablative-paint) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-15*