I was gave some andes line by a friend of mine who moving out of fla he bought and never used it. is it good mono for backing or should I sell it
Before moimoi, before yozuri line, befor bull buster, before a lot of lines there was ande, go take a look in the old pics section and see if those fish would satisfy you, most llikely it was ande in those reels!
Just an average fisherman.
If the line is old .Get 
rid of it. 
Anytime you buy a used reel, change the line.
You have no way to know what that line has been through, HOW would you feel hooking a 10ft hammer and he takes you to the knot,Woooops! there is NO KNOT! the end of the line rolls out the guides while your jaw hits the ground.
MANY things can/could be wrong there.
I say this for any new person reading, not you since you are getting "new line" 
And yes Ande line is top notch line in my book....used it for 40 years
GOOD LUCK,AND REMEMBER...NEVER TAKE BANANAS WITH YOU WHEN FISHING 
i love ande line my 6/0 and 9/0 have it. if they made a braid i would prolly use it on my spinning reels to.
World class line --the original and Holder of more world records then any other line .Great line and does not over test as much as Sufix.
SOUTH FLORIDA SHARK CLUB -President SFSC-Founding Member est 1983 SFSC-Website Administrator BIG HAMMER SHARK TOURNAMENT -Founder Rene Memorial Sharkathon -Founder NMFS Shark Tagger
Pink Ande is pretty much all I use on my big reels