How to Waterproof a Computer, PC or Controller Board

Computer boards, controller boards and logic boards fail fast around moisture, condensation and dust. A plastic-based protective coating seals them while keeping them serviceable. Here's how to do it right.

Why these boards fail around moisture

Humidity, condensation and dust cause corrosion and short circuits across dense, low-clearance boards. A coating keeps water and contamination off the copper and components; because it is electrically insulating, it also prevents shorts caused by dust and damp.

Clean, dry, then mask

Clean with isopropyl alcohol and dry fully, then mask everything that must keep working or stay removable: connectors, sockets and slots (RAM/PCIe/USB), switches, battery holders, heat-dissipation surfaces and calibration points. Good masking is the difference between a protected board and a dead one.

Apply by dip, spray or brush

Dipping gives full coverage, spraying an even layer, and brushing reinforces edges, cable entries and repaired spots. Build it in 2–4 passes at room temperature — no oven. A standard 100 µm layer is already fully waterproof; go thicker only for harsh mechanical exposure.

It stays repairable

The cured layer is removable with a dedicated solvent, so you can rework a single point and re-coat without losing serviceability. For coverage and a quote, send your board size on WhatsApp and we'll calculate the litres and price.

Liquid PCB Plastic Coating by MGCoat is a heat-free, plastic-based nano coating that waterproofs computer, PC and controller boards at room temperature — insulating, mechanically reinforced and removable for repair.

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