I'm not adverse to sealants--I like to experiment with them and even
wrote an article on them for a club magazine--but I've never seen the
need for one for radiator hoses (I do put a little silicone grease on
the inside to make them easier to remove years down the road). A
properly sized and fitted radiator hose should not leak; I'd look for a
small crack on the housing, a deformation or other issue causing a leak.
Radiator hoses are pliable and the pressure is low--they should seal
with just a properly installed clamp.
Permatex Seal & Lock is my go-to for tough jobs, but you're looking at a
semi-permanent 'fix.'
https://www.permatex.com/products/thread-compounds/thread-sealants/permatex-seal-lock-thread-compound-35-ml/
bs
On 5/17/2026 7:27 PM, Elton S wrote:
> I've tried a couple Permatex sealants for the radiator hoses without
> success. They still weep a small amount of fluid. What successful
> sealants have you used that you would recommend?
> Thanks for your replies.
> Elton
> BJ7
>
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