The `Rocky Balboa` star has struggled to cope with his grief since his son Sage passed away in July from a heart attack at the age of just 36.
Sylvester has sought comfort in his art and he insists his hobby has allowed him to work through his feelings of loss.
In an interview with the new issue of Britain`s HELLO! magazine, he said: "The paintings I`m doing right now aren`t too cheerful, but there`s something amazing about the process because what will come out of the canvas is so profound. It`s very therapeutic I tell you."
The 66-year-old actor has confessed he has bad days when he can`t come to terms with the death of Sage - his child with his first wife Sasha Czack, with whom he has another son Seargeoh.
The action legend doesn`t think his grief will ever fully go away and he realises he just has to try and accept what has happened.
He revealed: "I fall to pieces from time to time. You just do. It`s a cycle you just have to deal with, like a virus that keeps coming back. You go through this time of thinking, `It`s really horrible,` then you come out the other end and realise there`s not much you can do about it and you can forgive yourself ... Then you go through another cycle where you don`t forgive yourself ... It`s just an ongoing thing and I don`t think it ever goes away."
Sylvester has been married to actress Jennifer Flavin since May 1997. The couple have three daughters, Sophia, 16, Sistine, 14, and 10-year-old Scarlet.