Like so many others here, I've been haunted and mesmerized by "Sandcastles" since I was 12. And I, too, couldn't find a soul who had ever heard of it. I only saw the movie once, but I loved Jan-Michael Vincent passionately for years after. I couldn't really remember anything about the movie except the powerful emotional impact it had on me and, of course, the pre-adolescent lust.
I'm truly afraid to track down a copy of it because of the likely disappointment I'll feel comparing it to my idealized memory.
I've been so saddened in recent years to read of Vincent's descent into what sounds like a hell of depression and alcoholism. I want to remember him as the gorgeous, breathtaking, sensitive young man he was back in 1972. I was never impressed with his later career and the overly-macho and un-nuanced characters he played.
I wish him peace in this world or another life. Something about him made a profound impression on me at 12.