Radiator Stop Leak will not block cooling system passages and is Compatible with anti-freeze anti-boil solutions. Radiator Stop leak is a high quality water based sealant designed for temporarily fixing leaking cooling systems.
We bought this product to decanter down into the correct dose for our two KLX250s/KLX300s trail bikes radiators we use on our internet show of as a just "in case" when we do our adventures. While not a proven user, I got it on the reputation from being a long term user of all their motorcycle and motor vehicle products...regards "Kulabong Dreaming"