I recently built two low noise amplifiers (2 m and 70 cm) for satellite work, hoping to mount them right at the antennas.  They are in small Hammond die cast aluminum boxes.  To mount the boards inside, I had to drill several 4-40 thru holes through each box.  I’m worried about slow water seepage through these screw holes.  Can you suggest a good way to seal them?

Thanks!

Joe

K1MNY

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