Hi
I'm looking to stain and oil a Mahogany jem body/neck. Any advice on which type of oil would be best suited. In fact any advice on D.I.Y finishing would be most welcome.

i've used tung oil before with excellent results on an rg2020xtlb. mahogany is a good choice for oil finishes, it seems to take the oil very well even with multiple coats. i can't recall exactly what brand of tung oil i used, but if i can dig up the can i'll let you know.

I had an oiled mahogany guitar I used orange oil for unfinished furiture. It worked really well. I'm sure Tung oil is as good or better also.

Fret Doctor is apparently great. I use it on my fretboards. This stuff is holy!

http://www.beafifer.com/boredoctor.htm

Tung oil is the usual choice, though.

I don't know about the stain, but on my custom JEM swirl neck and on my aftermarket birdseye strat neck I used Tung Oil that I bought at Home Depot. I believe the brand was Formby's. As far as the stain, that being an oil based product, will probably inhibit the oil from soaking in some. That would probably just mean less coats of Tung Oil.

It is simple to apply. Just take an old tee shirt or similar lint free soft fabric and apply a coat. Let it soak for about 20 minutes I think is what time was, and then buff with a clean part of that cloth. Then recoat and repeat. Then let set for 24 hours. I put two coats on my necks and I think that would be a minimum to protect from moisture.

Good luck.