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Thru Hull Sealant Question

I'm taking the advice from sailnet members and pulling my boat to re seal the speed and depth transducer.

The sealant should be: for below water use, not permanent (5200), fast curing. I plan to use a non wood spacer.

I need to reuse the fittings so I plan to "Jack" out the thru hull fittings as suggested by Nigel Calder.

Suggestions are always welcome.

Thanks
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Re: Thru Hull Sealant Question

Sikaflex 291.

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Boat Vinyl Lettering and Graphics
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Re: Thru Hull Sealant Question

I used 3M 4200 on mine 7 years ago so far so good.
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Re: Thru Hull Sealant Question

We just finished our haul-out and installed one new through-hull using 3M UV4000.

I keep it on-board because it can be use above and below the waterline, and because I have successfully had an open tube stay viable for over 3 years by storing it in the freezer. [Thaw and bring to room temp before use...]

This stuff costs us over US$30/tube up here so long term storage of partially used tubes is important...

I have also had great success with 3M 4200, but haven't had occasion to keep an open tube in the freezer to determine if it stays viable... [It likely will...]

In case this is helpful.

Cheers! Bill


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Re: Thru Hull Sealant Question

I would check the manufacturer's thru hull installation instructions (if you can find them). Some manufacturer's say not to use certain sealants because they cause cracking of the plastic thru - hulls.

For example polysulphides should not be used with ABS or Lexan. Polyurethane based sealants should not be used on most plastics--acrylic, polycarbonate, PVC, or ABS. Marine Silicone is usually safe with plastics (not the household kind that smells of vinegar)

It's important to get this right! Of course if thru-hulls are metal, no problem using sealants below.

Boatlifecaulk - polysuphide
Sikaflex 291 - Polyurethane
3M 4000/4200/5200 are polyurethane based.
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Re: Thru Hull Sealant Question

BoatLife 'LifeSeal" is my first choice for 20 years. Safe with plastics, too.
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Re: Thru Hull Sealant Question

Quote:
Originally Posted by wrwakefield View Post
We just finished our haul-out and installed one new through-hull using 3M UV4000.

I keep it on-board because it can be use above and below the waterline, and because I have successfully had an open tube stay viable for over 3 years by storing it in the freezer. [Thaw and bring to room temp before use...]

This stuff costs us over US$30/tube up here so long term storage of partially used tubes is important...

I have also had great success with 3M 4200, but haven't had occasion to keep an open tube in the freezer to determine if it stays viable... [It likely will...]

In case this is helpful.

Cheers! Bill
Good tip....thanks


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