How to Measure and Mix Epoxy Resin Accurately for PCB Projects

Getting the measuring and mixing process right is crucial for any PCB resin application. Accurate preparation helps ensure a smooth, bubble-free finish that lasts. Here’s a practical guide to help you achieve reliable, professional results when working with epoxy resins.

Step-by-Step Measuring and Mixing

Start by checking the manufacturer’s recommended ratio—epoxy resins are often mixed by weight, not just by volume. For example, “Trasparente” typically uses a ratio such as 100 parts resin (A) to 45–50 parts hardener (B) by weight. Use a precise digital scale, and always measure your components separately before combining them.

Wear gloves and prepare your workspace on a flat, dust-free surface.
Pour resin and hardener into a clean mixing cup, ensuring the exact ratio is followed.

Mixing for Bubble-Free Results

Thorough mixing is key to avoid soft spots or incomplete curing. Stir the two components slowly for at least two minutes, scraping the sides and bottom of the container as you mix. Avoid whipping in air to minimise bubbles—a gentle, steady motion works best.

If the resin allows, let your mix rest for a short moment to allow any bubbles to rise and burst before pouring onto your PCB board. For applications with delicate circuits or clear finishes, like those achievable with “Trasparente” multipurpose clear epoxy resin, this step can make a noticeable improvement in the final outcome.

When Accuracy Matters Most

Precise measuring and thorough mixing are especially vital when coating electronic components or embedding delicate circuitry. Mistakes can result in curing failures, unwanted bubbles, or weak protection. In technical applications where durability and clarity are priorities, taking the time to measure and mix properly safeguards both the look and integrity of your finished PCB project.

Related guides

How To Resin A Pcb Board

Proper measuring and mixing forms the backbone of any successful resin coating, especially on PCB boards. For more tips and in-depth techniques, see our full guide on how to resin a PCB board.