I was given the MFJ-941D about 8 years ago. It was in rough shape when I got it from another ham. There were bugs in it and every screw and bolts was loose. I re-soldered a couple of points along the coil inside and gave it a good shot of canned air to dislodge dust and the nasty critters that had taken up home in it. I put it away and didn’t think much about it until I was revamping my station this week. The darn thing looked really bad with deep scratches in the powder coated top cover. There were lots of paint chips and the cabinet looked grungy. The self tapping screws were faded and bare so they needed attention too. Here’s a photo before I started >
I decided to use the same paint treatment that I had used on my Cushcraft R6000 a couple of years ago. The paint was from the auto section of our Canadian Tire store. It’s a tough paint used to touch up and paint plastic auto bumpers and I had a little left over – this would be the perfect project for it.
Surface preparation is important so I located some #320 and #600 grit sandpaper. First sanding was with the #320 grit and progressed to the #600 grade. I wiped the sanding dust off with a tack cloth and inspected my work. Sanding is not critical but I payed careful attention to the deep scratches. The bumper coating covers extremely well and I planned for at least 3 coats to hide any imperfections.
Here’s the finished product. Three coats of bumper coating, air dried for about an hour. There’s a half hour drying period between coats and no sanding between coats. The coating usually hides any imperfections and forms an extra tough scratch resistant coating – much better than the original MFJ powder coated finish. The tuner looks like it just left the factory.
Usually I leave painted components overnight before putting it all back together. After an hour the top cover and screws were ready as this coating dries to a hard finish very quickly.
This was a very easy project and didn’t take a lot of time or effort. If you decide to try this just make sure you have plenty of ventilation while you’re spray painting and keep your work area clean. Use a fresh tack cloth to wipe up sanding dust.