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No nearby bike shops so what do you know!
I use art latex/moulding latex, from art shops mixed about 50/50 with water and with some mica glitter flakes, fine ones, added to help plug larger holes. Seems to work okay, but dries faster than the non-latex stuff like Bontrager and similar. I know some people add windscreen washer fluid to lower the freezing point as well.
Hi
Teaspoon of copydex in the lid of a GT85 tin (or similar) fill with dilute washing up liquid and mix.
Add to tyre then another lid full of water to the tyre and stir a bit.
Last a month to six weeks before it needs re-doing.
Been using it for years.
Cheers
STeve
Copydex on the High St!!!!!
Can only find it on the web!
Litre of homemade latex/glitter/antifreeze £12 posted if your interested 
B&Q
Homebase
Wilkinsons
Staples
sometimes Newspaper shops in their art depts
Art shop
or
old fashioned iron mongers
I saw some tyre sealant advertised for bikes and cars in my local Mole Vally Farmers - Haven't tried it yet 🙂
What is all this crazy glitter talk about?
I like the sound of it.
Tell me some more
specialized airlock - is this a tubeless sealant or like slime/gunk for tubes?
I guess the glitter acts like the micro-grains like in the no tubes sealant to seal holes?
Makes your Camelbak pretty if you get a big blowout!!
halfrauds sell tyre sealant/latex for 8 quid, if you can bring yourself their establishment.
i work in halfords and the halfords tyre sealant is the same as the one sold in wilkinsons. Difference is youll pay twice the price in halfords!!!
Litre of latex from art shop. £10
Glitter from supermarket (cheaper) £0.50
puncture slime from wilkinsons £4
antifreeze £0 as you presumably have enough anywho, if not water.
Will do a lot of tyres if you dont **** it up a lot.