Loctite produce a liquid gasket that should do the job.

Hello Tony.

I would recommend Stags Wellseal Jointing Compound, I have used this for years on full size as well as model engines.

Wellseal is a liquid sealant that is applied with a small brush or spatular and is ready for assembly any time after it has gone tacky, it never hardens or dries out, so dismantling is always possible and it can withstand up to 200 Deg C.

Because it is a relatively thin liquid type sealant, rather than the thicker paste or silicone rubber type sealants, you don't get lumps of it squeezing out of the joint.

It isn't a gap filler, so it won't seal badly warped or damaged mating faces, but it is perfect for metal to metal joints where no gaskets are specified and is excellent for the small delicate parts of a model engine.

Tony, I used Loctite liquid gasket on the steam chest and cylinder heads of a Stuart Turner S9, I don't know how it goes on steam, the engine has only run on air, but I can't see any problem.

Ian S C

I have been using it for over twenty years, the brown liquid that is easy to apply, particularly in small quantities on small parts, and it's called Stag Wellseal on the packaging, whether a tin or a tube.

Blue Hylomar is completely different, being a thicker paste or jell and is ok for larger joints and can fill and seal gaps to some extent on warped or damaged faces, but I think Stag Wellseal is more suitable for Tony's small engine.

Incidently, Wellseal was also developed by Rolls Royce.

Edited By Lathejack on 24/08/2014 02:06:14

I think Stan is getting confused with Stag Jointing Paste which comes in type A & B (thin & Thick) and that is indeed red

Hi Guys,

Thinking of Hylomar, it can be thinned for application with a brush but for the life of me I can't recall what I was told the solvent is, can anyone help?

chriStephens

Thanks for that Michael, I'll do some experiments next time I buy a tube.

chriStephens