KAY-CEL 25TD Fiberglass Reinforced Panels
KAY-CEL 25TD Fiberglass Reinforced Panels are available in two thicknesses: 1/2" and 3/4". Standard sheet sizes include 24" × 48", 32" × 48", 48" × 48", and 48" × 96". KAY-CEL 25TD is a rigid, closed-cell, high-density polyurethane foam core panel with 18oz woven roving fiberglass reinforcement on both sides, engineered specifically for marine structural applications requiring a superior alternative to marine plywood. KAY-CEL 25TD features a sandwich construction with a 25 lb/ft³ density closed-cell polyurethane foam core bonded between layers of 18oz woven roving fiberglass. The closed-cell cellular structure provides complete resistance to water penetration - water does not enter the core ever - making it the professional standard for boat transoms, stringers, and structural marine panels where moisture infiltration causes catastrophic failure in traditional plywood. Compatible with both polyester and epoxy resins for easy lamination and bonding. Used in over 100,000 boats by professional builders and serious DIY restorers, KAY-CEL has established itself as the premier structural core material for marine applications. Whether you're building a new transom, replacing rotted plywood, or reinforcing structural panels, KAY-CEL 25TD delivers the strength, moisture resistance, and long-term reliability that marine professionals demand. Features 25 lb/ft³ density closed-cell polyurethane foam core 18oz woven roving fiberglass reinforcement on both sides Zero water absorption - closed-cell structure never absorbs moisture Compatible with polyester and epoxy resins Rot-proof alternative to marine plywood Exceptional strength-to-weight ratio Can be cut with standard woodworking tools Pre-wet with resin before laminating for maximum bond strength Proven in over 100,000 marine transom applications Marine-grade construction for long-term structural performance Applications of KAY-CEL 25TD Boat transom replacement and construction Stringers and structural hull components Deck coring and floor panels Bulkheads and interior structural panels Hatch covers and lids Marine staging and risers Swim platform cores General marine structural applications Transportation and specialty structural panels Any application requiring rot-proof plywood replacement 1/2" Thickness - KAY-CEL 25TD Available Sizes: 24" × 48" | 32" × 48" | 48" × 48" | 48" × 96" Core Density: 25 lb/ft³ closed-cell polyurethane Reinforcement: 18oz woven roving fiberglass both sides Popular for hatch covers, smaller transom repairs, deck panels, and structural applications requiring lighter weight 3/4" Thickness - KAY-CEL 25TD Available Sizes: 24" × 48" | 32" × 48" | 48" × 48" | 48" × 96" Core Density: 25 lb/ft³ closed-cell polyurethane Reinforcement: 18oz woven roving fiberglass both sides Professional standard for full transom replacement, stringers, and primary structural marine components requiring maximum strength Technical Specifications Core material: Rigid closed-cell high-density polyurethane foam Core density: 25 lb/ft³ Reinforcement: 18oz/15oz woven roving fiberglass both sides Resin compatibility: Polyester and epoxy resins Water absorption: Zero - closed-cell structure prevents all moisture penetration Manufacturer: Kayco Composites Installation & Fabrication Guidelines Cutting: Standard woodworking tools - wear dust mask, eye protection, and gloves Surface prep: Maintain dry, clean surface for maximum bonding strength Laminating: Pre-wet boards with resin before applying fiberglass Bonding: Remove any release agents or shiny spots before bonding Storage: Store indoors or protect from direct sunlight Need project guidance? Call 844-970-0650 for technical assistance on sizing, thickness selection, and installation requirements. Additional Thicknesses & Configurations Need 1", 1-1/2", or 2-1/4" thickness? KAY-CEL is available in additional thicknesses and unreinforced configurations for specialty structural applications. Request a custom quote or call 844-970-0650 for project consultation. What is the difference between KAY-CEL 25TD and marine plywood? KAY-CEL 25TD is a fiberglass reinforced closed-cell polyurethane foam core panel that provides zero water absorption compared to marine plywood which absorbs moisture over time, eventually rotting and delaminating. KAY-CEL maintains its structural integrity indefinitely in wet marine environments, while even the best marine plywood will eventually fail from moisture exposure. It is lighter than plywood, easier to bond with resin, and has been proven in over 100,000 marine transom applications without a single manufacturing-related failure. What does 25TD mean in KAY-CEL 25TD? The "25" refers to the 25 lb/ft³ core density of the closed-cell polyurethane foam, and "TD" indicates the Twin Double fiberglass reinforcement - 18oz woven roving bonded to both sides of the foam core. This combination of density and reinforcement provides the structural strength required for demanding marine applications like transoms and stringers. Which resin should I use with KAY-CEL 25TD? KAY-CEL 25TD is compatible with both polyester and epoxy resins. Epoxy provides superior bond strength and is generally preferred for transom and structural repairs. Polyester resin is an economical alternative that also bonds well. Always pre-wet the panel surface with resin before applying fiberglass layers, and ensure the surface is clean, dry, and free of any release agents before bonding. Which thickness should I choose for a transom replacement? 3/4" is the professional standard for full transom replacements in most outboard and sterndrive boats, matching the thickness of the original plywood in most applications. 1/2" is suitable for smaller transom repairs, secondary structural panels, hatch covers, and applications where weight savings are a priority. Always verify the original thickness before ordering to ensure proper fit. Can KAY-CEL 25TD be used in applications other than marine? Yes, KAY-CEL 25TD is used across multiple industries wherever a strong, lightweight, rot-proof structural panel is needed. Common non-marine applications include transportation panels, deer blinds, general staging and risers, and specialty construction applications requiring structural panels with zero moisture absorption. 4.9 ★★★★★ Based on 14 reviews Captain Dave R. Clearwater, FL ★★★★★ Best transom material available Replaced a rotted plywood transom on my 23' Mako with 3/4" KAY-CEL 25TD. Six years later and the transom is still rock solid with zero signs of moisture infiltration. Should have used this material from the start instead of plywood. Professional boat builders swear by it and now I understand why. Mike T. Chesapeake, VA ★★★★★ Perfect for stringer replacement Used 1/2" KAY-CEL for full stringer replacement on a 19' center console restoration. Lighter than the original plywood, bonded perfectly with epoxy, and I have complete confidence it will never rot. The fiberglass reinforcement on both sides makes laminating straightforward even for a DIY builder. Tom B. Galveston, TX ★★★★★ Excellent for transom and deck work Used 3/4" KAY-CEL for both transom and deck core replacement on a complete boat restoration. Cuts easily with a circular saw, bonds well with polyester resin, and the finished structural panels are noticeably stiffer than the original plywood. This is the only material I will use for structural marine repairs going forward. Rick S. Mobile, AL ★★★★☆ Great product, easy to work with Used KAY-CEL 25TD for a transom replacement on a 17' bass boat. Material is easy to cut and bonds well with epoxy. Make sure to wear a dust mask when cutting as the foam dust is significant. Overall the structural results are excellent and I have total confidence in the long-term durability.