I don't think so but I've never tried it. I think drying your gourds in the sun will help with mold. Salt will sometimes attract moisture to it later and that would be bad for paint etc.

I think I might keep thinking on it, and try it at the end of this season. I know that they pack meat to cure them in salt boxes.

So I was thinking that if I packed a gourd in salt and kept an eye on it. I might stumble upon a new method of curing them.

I have tried it and it works. I had a birdhouse gourd that broke at the neck off the vine and had started to rot so I quickly cleaned the insides, put salt in it and placed it in front of a space heater that blows and in 24 hours the rotting stopped and the gourd was hard. I did have to pour out liquid one time as it was drying