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#1 wild violet

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Posted 13 September 2017 - 09:00 PM

Is sika flex ok to seal my watertank lid down or is there a better product
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#2 island time

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Posted 13 September 2017 - 09:12 PM

a rubber gasket is better - with sika, it wont be easy to get the hatch off. And you will need to get it off if you sika it down, murphys law.


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#3 wheels

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Posted 14 September 2017 - 06:39 AM

Or you can use Silicon or Sika in this way. Run a decent bead all the way around. Make sure you circle every screw hole, right to the edge around each hole. Then allow it to dry fairly well. But before it is fully cured, then screw down the hatch.
The sealant will squash out in shape, but won't ahere to the Lid. So it acts like a rubber seal.


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#4 wild violet

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Posted 14 September 2017 - 06:45 AM

Thanks guys
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#5 w44vi

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Posted 14 September 2017 - 02:17 PM

One thing I would add to wheels post is I would use a neutral cure silicone that has no anti fungal added, sealant suitable for fish tanks, acetoxy silicones can on certain metals can cause corrosion 


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#6 wheels

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Posted 14 September 2017 - 05:15 PM

Good point. i should have asked what the tank was made from. I assumed GRP.


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#7 wild violet

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Posted 14 September 2017 - 06:50 PM

Its a steel keel tank with a steel lid would sikaflex still be ok have used on other fittings and havent noticed any corrosion
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#8 wheels

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Posted 14 September 2017 - 07:29 PM

Yep it would be fine. I imagine the Steel is coated in something anyway.


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