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Old 21-06-2010, 12:59   #1
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Help - Sikaflex: I'm Sick of it and it Flexes

Is it possible to apply too much sikaflex at a keel-hull joint?

It took all day to get to the old Sikaflex, remove it, and apply new Sikaflex (using a thorough, clean-rags wipe with Xylene wipe as a cleaner/primer).

Now, due to my inferior skill on this, I have a huge thick bulging multi-bead of new Sikaflex all around my keel.

Did I go too far?

Do I need to put barrier coat on top of it, or will simple bottom paint suffice?

(Thank goodness I don't have any pictures of it.)

Email address is: b-cf "at" hallmont "dot" com

2000 Beneteau 505 "Summer Boost"
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Old 21-06-2010, 15:16   #2
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The keel could have been colder when you applied the sika then warmer when it was setting. If any voids left the air expands and you end up with nice bulges.

But any excess of sika can be cut off / sanded off (beware - depends on particular type you used) and some sika stuff can be painted over.

Read up and go for it.

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Old 26-06-2010, 06:52   #3
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Apply Sikaflex®-291/292 in 20-25 mm-high triangular profiles. Each bead must form a continuous, closed ring, with no gaps. The same applies to the beads around the bolt holes.
The keel is then lifted into position, observing carefully the open time of Sikaflex®-291/292 and pulled up on the keel bolts. The adhesive that is squeezed out of the joint can be tooled to a smooth finish.
Traces of uncured Sika adhesives or sealants may be removed with Sika® Remover-208. On no account should other cleaning agents or Sika® Cleaner-205 be used for this purpose.

See page 15 of the Sikaflex Marine Handbook:
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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