Re: Last time I lend a guitar out.
Hmmm. I don't get the warpage. Maybe your friend did more than he said, but how should I know. But honestly, not to make you look foolish, but what you desribed wouldn't 'cause what your claiming as far as I know and I'm not a beginner or inexperienced to say the least.
I lent a guitar to a friend for a long period of time. It wasn't my main guitar but it was one I built together with my dad. Well unknown to me, he left it down at church all the time and yes don't be naive church kids steal things too and guess what? One of them stole my guitar. So that was good buy to my homemade guitar. And I still miss it to this day for the sentiment.
Now I only let someone else play my guitar if they are under my supervision, a qualified guitarist in some capacity, related to me or in my band (and even then it's iffy), and if they are willing to let me play theirs. I never let anyone take my guitar home. I never let anyone play it when I'm not around. I never let a kid play it that has never held a guitar or says "hey have you ever seen someone smash a guitar?" I never let anyone around it with fire, tools, sharp objects, water, beer, cleaning chemicals, ethanol, juice, glue or anything abrasive enough to damage it. Now that might sound extreme but it all comes natural with the supervision part. I don't have to check what's going on too hard to see that this is a situation in which my guitar is jeopardy.
The only person on this planet that can play Mace ('91 Rg560) without asking is my Pops, but he's the one who bought me my first, second and third guitars as well as let me learn on his, plus he handles every guitar with the utmost care. Oh I almost forgot, there is one more person could play it without asking that's my best friend Andy, that's because he's the one who gave me Mace. But I know he'd ask me anyways.