Sealants for windows and hatches

[Alastairdent]

We have a number of crappy plastic portholes and roof hatches that are leaking.

The timber and steel is never dry in this weather, so I was thinking of using some of these sealants:

UniBond Mega Seal Sealant
http://tinyurl.com/2najh3

Vallance All Weather Sealant
http://tinyurl.com/2p4pf3

Anyone used them, and if so, opinions please?

 

[starboard]

Use a polyurathane sealant like Sikaflex 291.....there are many equivalants around at half the price though.

Paul.

 

[Alastairdent]

The two I quoted *are* polyurathane sealants.

 

[PCUK]

Use a sealant that adheres in the wet such as Elast-O-Seal. These are usually found at builders merchants and have a 30 year flexibility guarantee!

 

[cliff]

Sika Flex if you don't want to remove them again or..... A butyl rubber bedding / sealing compound that can be removed later if needed.
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[colvic987]

thompsons roof and gutter sealant is a butyl rubber compound, i have used it for sealing a deck hatch, and in the process of using it to seal my windows, one of the other sailing mags s(^$*(&*^g T^%$y has a piece about sealing windows and they have used arbomast another butyl rubber compound..

Its messy to apply but once it has cured it is ok..

 

[AndrewB]

The sealants you suggest are not suitable for marine use.

You should use Sikaflex 291 if the sealant will not be in direct light, or Sikaflex 295 if it is (the latter is UV resistant). The only other sealant suitable for this application is 3M 5200.

 

[Alastairdent]

[ QUOTE ]
The sealants you suggest are not suitable for marine use.

You should use Sikaflex 291 if the sealant will not be in direct light, or Sikaflex 295 if it is (the latter is UV resistant). The only other sealant suitable for this application is 3M 5200.

[/ QUOTE ]

Why?

 

[graham]

Theres an article in the latest Sailing Today about refitting leaking windows.They didnt recommend Sikoflex due to the difficulty in removing it if you need to in the future.

 

[Alastairdent]

These aren't yacht windows, they are mostly hatches and rooflights bolted down onto wooden boards. the boards have a vinyl covering which is under the flanges of the hatches and rooflights. Watertightness depends on a sealant filling any uneveness and preventing capilliary action drawing in the water.

The plastic portholes are just crap. We will be replacing them with bronze at some point.