I think red loctite is SUPER strong. I can't stand when people use it to fit fittings. Makes them an ARSE to take off... Just pop down to halford and get some nutlock... Seals perfectly and is easy to take the fitting off when required...
They are Toms fittings and they look well nice.
I'll only use a small amount of the Red loctite then, don't think I'm ever going to need to take the fittings off so no worries on that front
I'd follow Munkeh's advice - red loctite is ninja-strength and if you ever want to get the fitting off again it'll need a blow torch and a BIG spanner.
Blue is what you need to use NOT RED, you will either break the fitting or scratch whatever it is screwed into when you try and remove it, you need heat and elbow grease to remove anything that is attached with RED loctite.
A bottle of Blue loctite or as said above thread lock from Halofords is a couple of pounds only so good luck with the low strength green, did I say you need blue, I think I did