I just noticed that YouTube has it available to buy or rent in HD. The preview clip appears remastered and is in widescreen 1080p.
https://www.youtube.com/watch?v=1voAtXttdc4
Don’t usually buy movies digitally, but for Slipstream I’d make the exception.
It’s saying for me “This video is not available”
I’m in the UK. Just clicked buy and it took me to payment.
[Edit] Just went ahead and bought it. It is indeed Widescreen 1080p. Never thought I’d see the day. Saw it in the cinema as a young teenager, can’t believe it taken this long to see a decent copy of it again.
Hopefully this means there’s a Blu-ray on the way, or even better, a 4K 🤣.