What would you use for bedding compound?

[burgundyben]

I have a weeping p bracket. It's bronze and bolted onto a hot moulded hull. About 5 inches wide and ten inches long. Bolts are 3/8ths. The engines are 210hp at 2600rpm, it's not an 8hp small yacht engine!

Boat was ashore 8 years and it been asking since 're launch.

I'm quite sure the builder would have used the old Sealastik non setting mastic cos they used it everywhere. It's no longer available.

I've used Arbomast BR for many years with great success. But I'm concerned that it's too thick for the bolts to pull it snug enough up against the hull as in the winter the Arbo is quite stiff.

I've been watching Tally Ho blog and Dolphite looks ideal. But no source in UK and not found an online supplier that will ship to UK.

Trad boat supplies have something called 'black pudding mix' about which I know nothing. Apparently can be thickened with cement which suggests it might be quite soft.

Thoughts?

 

[Poignard]

I'm a fan of CT1 so i would use that. It's soft and easy to work at first and then it cures to a stiff rubbery consistency.

You don't want to tighten it up too much as the sealant would be squeezed out leaving only a thin layer.

 

[Tranona]

Arbomast BR is butyl and just the job for your application. Any leaks will come through the bolt holes rather than from the hull/palm joint so make sure there is plenty of sealant around the bolts and under the heads.

 

[Whammeller]

A second vote for using butyl - Arbormast. CT1 would work but there is (as identified above) a squeeze out risk which is greater than with butyl.

 

[burgundyben]

A second vote for using butyl - Arbormast. CT1 would work but there is (as identified above) a squeeze out risk which is greater than with butyl.

But you see, my point is that I want a good squeeze out cos I want to know the P Bracket is up firm against the hull so it can't wonk about.

I plan to put a small countersink around the bolt holes, so once assembled there's a donut of sealant around the bolts, its worked well for me in the past.

I guess I'll do it with Arbo BR sooner rather than later, then over winter i can keep nipping up the bolts and looking for signs of oozing outness.

 

[PetiteFleur]

I also used Butyl when I refitted my p bracket, it had obviously been out of line since it was built(I was having to fit a new cutlass bearing every 3/4 yrs) so had to shim it to get it in line then used butyl to seal it all together. No leaks at all, and hopefully I won't need to replace the cutlass bearing so frequently.