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Hondabond, Threebond, Wellseal

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Seabeowner:
Looking to buy some sealant for crankcases and the like and when you search Hondabond a variety of sealants turn up.
Had some Threebond 1215 (I think) some time ago and that did a good job. Have some Threebond 1104 (rubber based), but that's gone off. I see Hondabond HT is silicone rubber based and thought I was supposed to steer clear of that.
Is Wellseal any good? What about Yamabond 4 or 5?
Thanks

Seabeowner:

--- Quote from: Seabeowner on August 31, 2025, 04:06:42 PM ---Looking to buy some sealant for crankcases and the like and when you search Hondabond a variety of sealants turn up.
Had some Threebond 1215 (I think) some time ago and that did a good job. Have some Threebond 1104 (rubber based), but that's gone off. I see Hondabond HT is silicone rubber based and thought I was supposed to steer clear of that.
Is Wellseal any good? What about Yamabond 4 or 5?
And I really want it grey.
Thanks

--- End quote ---

Skoti:

--- Quote from: Seabeowner on August 31, 2025, 04:06:42 PM ---Looking to buy some sealant for crankcases and the like and when you search Hondabond a variety of sealants turn up.
Had some Threebond 1215 (I think) some time ago and that did a good job. Have some Threebond 1104 (rubber based), but that's gone off. I see Hondabond HT is silicone rubber based and thought I was supposed to steer clear of that.
Is Wellseal any good? What about Yamabond 4 or 5?
Thanks

--- End quote ---

Discussing crankcase sealant is probably a bit like discussing engine oil or tyres I suppose, everyone has their own preferences.

But during the seventies in the trade we always sparingly applied Blue Hylomar to spotlessly clean crankcase joints and cleaned off the surplus with a petrol rag when assembled and set.
It worked then and still seems to work now, for me at least.

Good luck

 
   

McCabe-Thiele (Ted):
I used Hondabond as recommended by NJ I think.

It needs to be a really thin layer of sealant, wearing surgical type rubber gloves makes this easier, you don't want excess sealant entering the inside of the engine

Bryanj:
Dont know about new wellseal but the stuff in the 70's set hard like a shellack so would not recommend it.
Hylomar we used to use BUT THINLY, yamabond and hondabond should be similar and ok

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