[sdiy] Large heat shrink alternative (cling wrap)

[John Speth]

Does anybody have any experience or knowledge about food grade LDPE 
cling wrap long term performance in heat shrink applications?

I'm doing an organ repair in which I need to physically gang capacitors. 
For that I'd need 4 inch heat shrink tubing. It's around total $50 for 
me to get 4 feet of it from Mouser, too much for me. I've decided to use 
grocery store variety cling wrap and gently heat it to shrink it. A 
couple of tests tells me it'll work just fine. My only concern is 
longevity. For example, what will it look like in 5 or 10 or 20 years? 
Hopefully not a pile of old dried out crumbly plastic shards. The 
product I'm using is LDPE (low density polyethylene), according to the 
product box. I couldn't find information about how it ages.

Thanks - JJS