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Old 02-17-2019, 05:17 PM   #1
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Exterior caulk?

So we have some yucky cracked caulk on the exterior that needs to be replaced. We have already heard several opinions in what to go back with.
So what say you?
Is regular household exterior caulk good enough or.....something else?
Someone suggested 5200. Pretty sure we are not going to use that.
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Old 02-17-2019, 05:47 PM   #2
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I would probably use 3m 4000uv or 3m 3000uv. I would never use silicone on a boat. For rebedding hardware or window frames I would use butyl tape. Also look at some of the Total Boat products offered by Jamestown Distributors. Those guys are pretty helpful if you give them a call.
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Old 02-17-2019, 05:58 PM   #3
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I normally have used 5200

However, a lot of the construction/remodel guys around here in Florida are using this. Some of it has been in place for 3 years so far and it still looks good and is sealing.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I've used it in a few places myself and it works very well. I plan on taking some north when we live on the boat for the summer as I have a couple of pesky leaks that need attention.
This stuff is pretty sticky, flows well and hasn't yellowed so I think it's worth a try.
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Old 02-17-2019, 06:26 PM   #4
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If you want to get something that can stand a rocket fire and that will need you to use TNT to remove it go for 5200.
Joke apart what caulking? Where? Windows? Anything else? Your choice depends on your usage.

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Old 02-17-2019, 06:27 PM   #5
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Greetings,
Ms. S. I second Mr. PM's suggestion of 3M 4000 (never used 3000). Stays put and pliable and doesn't yellow.



5200?


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Old 02-17-2019, 07:57 PM   #6
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I only use 5200 below the waterline where I plan on never removing the item. I have been using Sika 295 (I believe). So far I really like it. In 2 years it has not turned yellow or given way.
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Old 02-17-2019, 08:23 PM   #7
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5200 should not be used where it is exposed to sunlight. It’s great for bedding a fitting but not if you need a bead of exposed caulk. UV causes it to break down.
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Old 02-17-2019, 08:33 PM   #8
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Sikaflex. 291 I think. But check the different varieties for the one which best suits. A tenacious adhesive as well as a sealant.

Not all silicones reject paint, some can be painted, and that some cannot is often the reason to reject them. But, Sika, and most polyurethanes, last longer.
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Old 02-17-2019, 08:37 PM   #9
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Some silicone products can't be easily painted over. If you run into that problem, the paint sold for covering stains usually works. Best if you sand first.
I know the marine products are expensive, but they were tested against the sun, wind and salt water to excel for a long time. Most house products aren't made with the ocean in mind and don't last as long. Even exterior products. The water based ones absorb moisture and are a magnet for mold.
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Old 02-17-2019, 09:20 PM   #10
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Quote:
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5200 should not be used where it is exposed to sunlight. It’s great for bedding a fitting but not if you need a bead of exposed caulk. UV causes it to break down.
Are right,done made that mistake!
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Old 02-17-2019, 09:33 PM   #11
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In my previous post I said Sika 295, my bad, for general caulking I use Sika 291. I use Sika 295 when caulking plexiglass. I never use silicone caulk.
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Old 02-17-2019, 09:39 PM   #12
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I’ll tke some pics tomorrow of the different areas where the caulk is a mess.
I started scraping some today and found a place where the caulk was wet..sticky..left residue all over my hands. WTH?
All we can think is that the broker we bought the boat from said he had his guys re do some caulking before we bought it. I don’t know what it is or why it’s wet and sticky but it’s concerning.
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Old 02-17-2019, 10:15 PM   #13
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I...All we can think is that the broker we bought the boat from said he had his guys re do some caulking before we bought it. I don’t know what it is or why it’s wet and sticky but it’s concerning.
"Wet and sticky" is good in the right place, but not if it`s caulk, I`ve not seen that happen. Hope it`s not hiding something,get it cleaned out and replaced with polyurethane. Note Sika stays white,whereas another locally made polyurethane works as well but yellows with age.
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Old 02-18-2019, 01:22 AM   #14
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Yes, I used to use Boatlife Lifeseal, but it does yellow so I went to Sika 291.
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Old 02-18-2019, 05:32 AM   #15
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Calking only lasts for 6-10 years , then it will need replacement , best if done as PM, before the leaks start to rot the boat.

Dolphinite is probably the easiest to remove , clean off and replace.

Butyl tape is easy to replace , best when used on ports or hatches built to use it.


5200 is a glue and only for parts you are willing to damage to remove.
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Old 02-18-2019, 06:35 AM   #16
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I found this link informative about Sikaflex products:
https://usa.sika.com/content/usa/ind...1b100sa02.html
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Old 02-18-2019, 08:56 AM   #17
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Quote:
Originally Posted by Pack Mule View Post
I would probably use 3m 4000uv or 3m 3000uv. I would never use silicone on a boat. For rebedding hardware or window frames I would use butyl tape. Also look at some of the Total Boat products offered by Jamestown Distributors. Those guys are pretty helpful if you give them a call.
I agree - 3m 4000 is top notch.
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Old 02-19-2019, 07:17 AM   #18
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My experience with 3m 4200. I used this product to seal the pilot house glass on “Obsession”. This was a glass to aluminum seal and worked well for the first 2 years. Last fall I noticed it becoming soft and sticky in places on the front windows. I called 3m and they were less than helpful in assisting me in finding a cause or solution. The only thing used on the windows is windex and aquapel. Customer service said they only test their product against other 3m products. Not trashing 3m but removing/taping/applying new caulk is pretty darn labor intensive. I will definitely go with another product this spring. Just my $.02

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Old 02-19-2019, 07:24 AM   #19
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My experience with 3m 4200. I used this product to seal the pilot house glass on “Obsession”. This was a glass to aluminum seal and worked well for the first 2 years. Last fall I noticed it becoming soft and sticky in places on the front windows. I called 3m and they were less than helpful in assisting me in finding a cause or solution. The only thing used on the windows is windex and aquapel. Customer service said they only test their product against other 3m products. Not trashing 3m but removing/taping/applying new caulk is pretty darn labor intensive. I will definitely go with another product this spring. Just my $.02

Don
I know 3m 4200 is sensitive to some chemicals (teak cleaners for one) that can cause it to fail. 3M 4000 does not have these same problems. These are different products - 4200 is a polyurethane while 4000 is a polyether.
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Old 02-19-2019, 11:16 AM   #20
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This is where the wet caulk is.
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