I’d like to have a go at building a marble roller coaster like in this video How to make a STEEL MARBLE TRACK with basic tools! step by step guide - YouTube
I’m new to soldering, having only used my soldering iron a few times without flux to join some small wires. The video recommends this flux https://www.amazon.co.uk/Griffon-Universal-Soft-Soldering-Flux/dp/B01G63VLM0 but it doesn’t seem to be available in the UK. I imagine there would be a UK version but I’m not sure what to search for.