Dr Sludge is an invaluable puncture preventative for those who find themselves hampered by flats. Their products include pre-filled inner tubes with the correct dosage of sealant already applied as well as a specially formulated tubeless sealant which is strong enough to instantly seal punctures in high-pressure tubeless tyres. Dr Sludge also produce puncture prevention tapes that are easily applied to the inside of your tyres creating a sturdy barrier between road debris and your inner tubes.