CNC Machining Delivers Waterproof Aluminum Parts

When Water Gets In, Everything Fails

You’ve designed a high-performance aluminum part, maybe for outdoor use, automotive housing, or marine equipment. You’ve dialed in your CAD specs, picked the right alloy, and sent it off for CNC machining. But then, the nightmare: water seeps in, corrosion starts, and your part fails in real-world conditions.

This isn’t just inconvenient. In industries like aerospace or medical, it’s a complete deal-breaker.

So how do you make aluminum CNC machining parts that stay waterproof under pressure, literally?

We’ll walk you through sealing strategies, design tweaks, surface finishing techniques, and even machine settings that help you avoid leaks, corrosion, and early failure in machined aluminum parts.

Why Aluminum, and Why the Waterproofing Challenge?

Aluminum is lightweight, strong, corrosion-resistant, and incredibly machinable, making it a top material for CNC projects across automotive, aerospace, robotics, and consumer products. But here’s the thing:

Aluminum is not naturally waterproof in machined form, especially when threads, cavities, or complex geometries are involved.

While its oxide layer helps resist corrosion, poor design or machining can leave micro-gaps, tool marks, or unsealed threads that let in moisture.