Project Planning, Material Selection, and Build Documentation Setup

Why Planning Comes First

In professional composite boatbuilding, fabrication errors are expensive and sometimes unfixable. A gelcoat blistered by trapped solvent, a laminate too thin for its structural load, or a core delaminated because the resin was never catalyzed correctly — all of these failures share one root cause: inadequate planning before the first drop of resin is mixed. The capstone project treats planning as a deliverable in its own right. Your signed build plan must be complete and approved before you touch a mold.

This approach matches industry practice. ABYC and ACMA both expect technicians to work from documented procedures, and ACMA CCT exam content specifically tests whether candidates understand process planning as a discipline separate from hand skills.

Reading the Project Brief

A project brief defines what you are building, what it must do, and any dimensional or performance constraints. For this capstone the brief specifies a 24-inch by 36-inch fiberglass hatch cover with a nonskid gelcoat surface. Before you draft anything else, read the brief twice and highlight every stated requirement — dimensions, surface finish, structural function, weight limit if given, and the environment the part will see (saltwater, UV exposure, traffic load from crew standing on the hatch).

Each highlighted requirement becomes a traceability anchor. Every decision in your build plan — resin system, reinforcement weight, number of plies, core choice — must be traceable back to a brief requirement and supported by a standard reference or a manufacturer SDS. If you cannot trace a decision, you cannot defend it to a quality auditor or an employer.

Bill of Materials

The bill of materials (BOM) lists every consumable you will use, with quantity, product name, and the SDS document that covers it. For a marine composite part the BOM typically includes:

• Resin system — polyester, vinyl ester, or epoxy, with the correct hardener or catalyst and mixing ratio
• Reinforcement — woven roving, chopped strand mat, or biaxial fabric, specified by weight per square yard (or grams per square meter) and total area needed
• Core material — balsa, PVC foam, or similar, if called for by the structural design
• Release agent — wax or semi-permanent PVA, listed separately
• Gelcoat — with pigment if applicable, and the correct promoter or catalyst

Quantities are estimates at BOM stage, but they must be calculated, not guessed. Use the fiber-to-resin ratio formula you practiced in the Layup course to determine how much resin your reinforcement requires.

Calculating Estimated Resin Volume

The standard approach for open-mold hand layup is to apply resin at a fiber-to-resin ratio by weight of approximately 40:60 (40% fiber, 60% resin) for woven fabrics, though the exact ratio depends on the fabric and process. From the dry fabric weight you can calculate the wet resin weight, then convert to volume using the resin's density (typically listed in the SDS or technical data sheet, commonly around 1.1 to 1.2 g/mL for polyester resins).

Always add a waste factor — typically 10 to 15% — to account for mixing losses and wet-out waste. Your BOM quantity should reflect the waste-adjusted figure.

Laminate Schedule

The laminate schedule is a ply-by-ply table that records, for each layer:

1. Ply number

2. Material description (e.g., 1.5 oz chopped strand mat, 24 oz woven roving)

3. Fiber orientation (0°/90°, ±45°, random)

4. Resin system

5. Cured ply thickness (use the fabric manufacturer's value or published engineering tables)

Fiber orientation drives structural behavior. For a flat hatch cover carrying primarily bending loads, balanced symmetric layups (equal material on each side of the neutral axis) reduce warping after cure. The ACMA CCT process knowledge section and the ABYC Composite Boat Building reference both address how layup sequence affects finished part performance. Cite the specific section of whichever reference you use.

Sum the individual ply thicknesses to project the finished laminate thickness, then check that value against any minimum thickness implied by the brief or by standard reference.

PPE and Ventilation Requirements

Your build plan must contain a dedicated PPE and ventilation section. For polyester or vinyl ester resin systems the hazards are well established:

• Respiratory — styrene vapor is released during layup and cure. Air-supplied respirators or organic-vapor respirators approved for styrene must be worn whenever resin is open. Review the SDS for the specific product's exposure limit and required cartridge type.
• Skin and eye — resins and catalysts (especially MEKP) are severe skin and eye irritants. Chemical-resistant gloves (nitrile or neoprene as specified on the SDS) and splash goggles are required.
• Ventilation — the work area must maintain vapor concentrations below the permissible exposure limit. Confirm that shop ventilation is operating and document the minimum air-change rate or exhaust CFM required.

If any SDS, PPE requirement, or ventilation plan item is missing from your build plan, the plan will be returned for revision before fabrication can begin. This is a non-negotiable quality hold point.

Quality Hold Points

A hold point is a stage in the build where work stops and a defined check must pass before the next step begins. Hold points protect the part and protect you. Typical hold points for a composite layup include:

• Pre-layup — mold surface prepared, release agent applied and cured, all materials on hand and within shelf life
• After gelcoat application — thickness measured with a wet-film gauge, surface checked for pinholes or sags before laminate begins
• After each major laminate stage — visual check for dry glass, voids, or delamination; dimensional check if applicable
• Final cure — Barcol hardness test or thumbnail test to confirm full cure before demolding

Document each hold point in your quality-control checklist with the acceptance criterion and the name of the person responsible for sign-off.

Setting Up Your Project Binder

The physical binder and its digital mirror folder are quality records. A quality record has value only if it is complete, organized, and traceable. Organize both by tabs: (1) Signed Build Plan, (2) BOM, (3) Laminate Schedule, (4) SDS Set, (5) Photographic Log Template, (6) QC Checklist. Number every page. Date every entry as you make it. Your instructor must review and sign the plan before you proceed — that signature is the formal approval to fabricate.