Having a tiny, vested interest in those grills, gotta say, I think they turned out perfect.
Looking forward to watching the rest of the restore.

So, Fed Ex was right? But also wrong?

Still not sure.

I've taken a cheap HF gun and converted it for regular latex following these steps:

I've done 3 or 4 cabs now this way.
You just have to experiment with thinning.
Being latex, I just thinned a little at a time with water until desired flow was achieved.

I have the kobalt equal of this one.
Scored it off c/l a few years back for $175 if I recall.
It's a 110v single stage 30 gallon.

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+1 for connectors. I know HEP does it and I took a page from his book.
Here is a pic from the last restore I did, although it was only a Motordome, I installed connectors pretty much throughout the game.

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Is it one of these style bushings?

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Not that I'm aware of, was going to offer you one of mine if you didn't already have some enroute.

Hmm, all those garage door photos, I think you secretly sent this to HEP .
It turned out fantastic Scott, really looks like a work of art!
I've enjoyed following the journey, what's next?