J. Michael Muro's satirical hobo-melt masterpiece Street Trash.
Starring: Mike Lackey, Vic Noto, Bill Chepil and James Lorinz in a debut appearance.
I have no idea how many melt movies there are but this along with a 1993 Australian picture Body Melt are the only ones I've seen.

Originally based on a ten minute student film directed by Muro and starring Mike Lackey.
The story beings in a degraded area of lower Manhattan, populated by hobos and scumbags. The owner of a small liquor store cleans out the basement and comes across a case of cheap wine that's over 60 years old named "Tenafly Viper". He decides to sell it for 'a buck a bottle' figuring he can sell it to the hobos, little does he know it's 'gone bad' and whoever drinks it will begin to melt away in a hideous yet colourful fashion. Parallel to this there's a cop who's trying to understand why people are melting and gang of sociopathic hobos living in a junkyard lead by a deranged Vietnam veteran.



Muro's decision to shoot using a steadicam was an expensive venture but evidently paid off, although Muro has yet to direct another film he has become one of Hollywood's top steadicam operators.

A flick that's filled to the brim with credible performances from the ensemble cast, character's filthy visages, skidrow locations, comically disgusting deaths and injuries; including a scene where one hobo is castrated, he then frantically runs around the junkyard attempting to find the severed member while the other hobos play a game of 'keep-away' with it.
I love the use of bright colours during the melt scenes, it seems much more effective and memorable than your typical 'blood red' viscera. Reminiscent to Raimi's Evil Dead II (1987).
Street Trash is probably one of the most entertaining and original exploitation gorefests out there.