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Old 15-06-2018, 15:40   #1
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Chain plate goop

I'm in the process of going through and inspecting my chain plates, some are easily accessible, some less so and have discovered a couple that are covered in some sort of brown bonding. I've attached a picture below, it's rock solid and is bonded to the metal and the surrounding boxing. Does anyone have an idea what it is and why the f*** the builder decided use it?!
Many thanks.
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Old 15-06-2018, 17:14   #2
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Re: Chain plate goop

Looks like Pro Seal, extremely bad ass stuff. If that's it, it's an aerospace poly sulphide 2 part sealant. Hit it with a power wire brush and it will smell like sulphur.
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Old 15-06-2018, 18:48   #3
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Re: Chain plate goop

Pro seal AKA B2 is very rubbery, this is I believe hard like Bondo?
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Old 15-06-2018, 19:34   #4
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Re: Chain plate goop

Yep proper solid, a bolster and hammer has little effect......
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Old 15-06-2018, 19:46   #5
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Re: Chain plate goop

One of the West Systems fillers turns epoxy that color. How did you get them off?
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Old 15-06-2018, 20:00   #6
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Re: Chain plate goop

I've not tried yet, I'm seeking inspiration through the medium of beer
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Old 15-06-2018, 20:31   #7
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Re: Chain plate goop

Revealing the make, model, and year would be helpful. Dolfinite bedding compound was commonly used by many boatbuilders.
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Old 15-06-2018, 20:37   #8
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Re: Chain plate goop

It a Bruce Roberts 44 built in 79 at the Vannoy shipyard in Washington, what's odd is that of the 12 chain plates that I've looked at only 4 are covered in the goop (which no doubt I'll be grateful for!)
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Old 15-06-2018, 20:50   #9
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Re: Chain plate goop

Could it possibly be overflow from foamed in place insulation? Some steelies have used such in the past... and it looks kinda like your goop.

Otherwise, epoxy thickened with phenolic microspheres has similar appearance, but that isn't often used for sealing chainplate penetrations.

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Old 15-06-2018, 21:11   #10
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Re: Chain plate goop

Yea I'm with Jim Cate, looks like phenolic glue but I have no knowledge of the builder
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Old 16-06-2018, 08:24   #11
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Re: Chain plate goop

It's defo not insulation, although the hull has been sprayed, also the boat is fibreglass and not steel. So going with the thickened epoxy. Yay
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Old 16-06-2018, 10:43   #12
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Chain plate goop

If itís what I think it is, itís going to take a wood chisel and a hammer or a rivet gun to bust it off.
I would only grind as a last resort, cause that would be a real mess.
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Old 19-06-2018, 19:08   #13
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Re: Chain plate goop

So had a spare hour this arvo and attacked the goop.

Hammer and chisel was needed to start (the chisel is now looking somewhat worse for wear.....), but once I made it through to the chainplate I used a hooked hose puller to get behind it and lever it off, made good progress as the goop doesn't actually bond to metal, but made a mess of the surrounding box work as the goop really bonds to wood.

Two down and a number to go.
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