How to Waterproof a PCB: Methods and Best Practices

Moisture, humidity, condensation, salt and washing are common causes of electronic failure. Coating a PCB is one of the most cost-effective ways to extend its life in harsh or outdoor environments. Here are the practical steps.

Clean and dry the board

Remove flux residue, dust and oils with isopropyl alcohol and let the board dry fully. Trapped moisture or contamination under a coating reduces adhesion and protection.

Mask functional areas

Connectors, switches, moving contacts, heat-dissipation surfaces and calibration points should be masked before coating so they stay accessible.

Choose an application method

Dipping suits full coverage, spraying gives even layers, and brushing is ideal for local reinforcement of edges, cable entries and repair zones. Liquid PCB Plastic Coating supports all three.

Cure and test

Let the coating cure fully, then verify with a controlled water test on a powered low-voltage board and a simple scratch test. For immersion, the whole assembly must be sealed with no trapped air.

Liquid PCB Plastic Coating by MGCoat is a heat-free, plastic-based nano coating made for waterproofing PCBs, sensors and electronic circuits with mechanical reinforcement.

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