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5200 and silicone remover.

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rrick
Captain

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USA
261 Posts

Initially Posted - 05/20/2014 : 20:38:00

I come across too many threads regarding polyurethane adhesives impossible to remove. And a few threads that rightly consider silicone sealants, once cured, to leave behind a slick residue preventing further sealant adhesion. Instead of commenting a hundred times, I'll make a thread.

Home Depot: Motsenbocker's Caulk and Adhesive remover. Gel. More difficult in keeping fresh active product on site of attack. Less drips.

Online: Marine Formula by DeBond. Aerosol spray. Penetrating with very quick action. Overspray and drips can dewax gelcoat.

Both are effective on silicone and polyurethane caulk (including 3M 5200). Both should be tested on substrate. Both are citrus scented and clean up with either rubbing alcohol or soap and water. The required temperature is over 70F.

My experience, I like the Marine Formula by DeBond. One day, one razor blade, one tenth of a 12 oz can: I pulled a threaded through-hull fitting along with removing all excess polyurethane. I allowed another day for the isopropyl alcohol cleanup to evaporate before rebedding another thorough-hull.

Not for the busy boatyard, but if you have other things to do, spending a few minutes a few times over a day, the product can release a 3M 5200 "weld." Just so you know the attitude of this kind of product to boatyards and why it isn't popular: boatyards will cut a propshaft to change props over spending time with heat and penetrating oil (I've seen it!).

Molly Brown: 1967 Grand Banks 32-#34. Bronze, mahogany, teak, oak, with 120hp diesel to push all 10 tons. Currently an abuser of the bilge pump. Also... The Tall Rig Spirit: 1978, #973, Cast Fe Fin Keel on a Trailer

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Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 05/21/2014 : 16:21:47

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Not for the busy boatyard, but if you have other things to do, spending a few minutes a few times over a day, the product can release a 3M 5200 "weld."<hr height="1" noshade id="quote"></blockquote id="quote">
Yes, it can eventually be chemically removed, but this is why a few of us practically shout that polyurethanes are not bedding compounds. Use the right product for a job and life is better. Polysulfide, maybe the new polyethers, butyl tape (butyl tape is really a super viscous fluid and I would never use it below the waterline. Mechanically fastened fittings don't need to be glued in place, the should have a firm, compliant, modestly adhesive bedding with good elasticity to seal. However, evaluating a couple of products for removal of polyurethane is good information. Thanks for the report.

Edit: and really cleaning silicone residue is great info since practically every old boat has had silicone applied sometime in its life.

Edited by - Dave5041 on 05/21/2014 16:25:08

Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts

Response Posted - 05/21/2014 : 21:22:01

Thanks! I might have a need to test one of these soon... The builder of my boat apparently used 5200 for everything, which has already caused some problems.

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bigelowp
Master Marine Consultant

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USA
1776 Posts

Response Posted - 05/22/2014 : 19:09:38

Thanks for great input . . . this is the kind of info you can't find elsewhere. Now all I need is the time (and patience) to tackle a couple projects . . .

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Stu Jackson C34
Admiral

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844 Posts

Response Posted - 05/24/2014 : 14:03:42

5200

SATAN'S GLUE

Edited by - Stu Jackson C34 on 05/24/2014 14:04:13

rrick
Captain

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USA
261 Posts

Response Posted - 05/25/2014 : 02:21:41

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Stu Jackson C34
 5200

SATAN'S GLUE

<hr height="1" noshade id="quote"></blockquote id="quote">
Scary how hardware stores only offer 5200 or the equally evil marine grade silicone.

Edited by - rrick on 05/25/2014 17:05:18

Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts

Response Posted - 05/25/2014 : 09:12:26

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.