Mil Gauges for Gel Coat & Resin


How to Measure Wet Liquid Films Like Gel Coat and Resin with Mil Gauges

Achieving the right film thickness is critical in fiberglass layups and coating applications. Too thin, and your surface won’t have the strength or durability you need. Too thick, and you risk cracking, wasted material, and extended cure times. TAP Plastics’ Mil Gauges (also known as gel coat thickness gauges) provide a simple, accurate, and repeatable way to measure wet film thickness while applying gel coat, resin, paint, or other coatings.

How It Works:
Just place the notched edge of the cylindrical gauge into the freshly applied wet film. The last tooth marked with resin indicates your coating’s wet mil thickness. This straightforward method helps you achieve consistent coverage, reduce rework, and ensure the integrity of your fiberglass projects.

Available Ranges:

  • 3 to 18 mils – Ideal for thin coatings and light applications

  • 10 to 35 mils – Perfect for standard gel coat thickness checks

  • 40 to 65 mils – Best for heavy-duty laminates and industrial coatings

Key Benefits:

  • Accurate measurement of wet film thickness in mils

  • Prevents under- or over-application of gel coat and resin

  • Durable construction for long-lasting performance

  • Compact, easy-to-use tool for both professionals and DIYers

  • Works for gel coats, resins, paints, and other liquid coatings

Applications:

  • Boat building and repair (marine gel coats)

  • Automotive and RV finishing

  • Fiberglass layups and mold construction

  • Industrial coatings and resins

  • Spray-applied or brush-applied finishes

For anyone asking “how do I measure wet gel coat thickness?”, TAP’s Mil Gauges are the reliable answer. Choose the range that matches your project and ensure every application is applied with precision.