Hi Jester ,
Well , , it sounds as if this jet he bought is a goner . Done . Finished . It's flying time will be measured in microseconds .......
Now , since this is someone you want as a friend , and he won't take your experienced advise , your only option will be to either try to talk him into letting you buddy box him on his jet , let him take it for a moment while "3 mistakes high" , and hopefully he'll quickly see it ain't as easy as it looks , Or , make sure you are
NO WHERE NEAR the field on the day of the shredding of the foam .
I hear ya that your buddy is putting ya into a kinda crappy situation , and I commend you for being friend enough to try to help him , hard headed as he may be .....