Bedding Teak Strips.

PuffTheMagicDragon

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The seats in my cockpit have long strips of teak that are held above the fibreglass by shorter strips, running athwartships, that are screwed to the upper ones from underneath. Each of these short strips – and, therefore, the whole assembly - is bolted to the fibreglass through the spaces that are left between the long ones.

Cleaning accumulated dirt from underneath is a nightmare; sloshing the dirt out with water is not good because not all the water drains away.

I am thinking of removing these assemblies, ripping the long strips lengthwise to obtain narrower ‘planks’, and then fixing them permanently in place using some form of adhesive, leaving something like a 5mm gap between the planks to be filled later with ‘caulking’. The idea is that the new system will allow no water to be inaccessible and any that remains may be easily wiped off.

Can someone answer these questions, please?

1. Is Sikaflex 291 suitable? Are there other alternatives that are less expensive?
2. The Data Sheet for Sikaflex 291 says “may be used for light duty bonding”. How light is ‘light duty’? If I use it, will the planks stay put?
3. What thickness of glue-line should I aim for when pressing the planks down onto the fibreglass? Is there a minimum?
4. Since the ‘caulking' will be purely decorative, is it really necessary to put a bond-breaking tape down each seam?
5. Do I just scrub the teak periodically or can I use some form of varnish? (eg. Le Tonkinois).
6. Temperatures get rather high in summer (upper 30’s) and the UV Index is regularly 11+. Does this matter to the adhesive?

Thanks in advance to all; I am sure that, as usual, advice will not be scarce!

Happy Holidays.
 

fluffc

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1. Is Sikaflex 291 suitable? Are there other alternatives that are less expensive?
Dow Corning 'marine adhesive sealant' is cheaper.

2. The Data Sheet for Sikaflex 291 says “may be used for light duty bonding”. How light is ‘light duty’? If I use it, will the planks stay put?
err... only use 291 if you <u>never</u> intend to remove the planks again... it's a 'structural bonding' adhesive...

3. What thickness of glue-line should I aim for when pressing the planks down onto the fibreglass? Is there a minimum?
At a guess, 6mm.

4. Since the ‘caulking' will be purely decorative, is it really necessary to put a bond-breaking tape down each seam?
Very important, as without the 291 will bond to the bottom of the seam and when the inevitable expansion/contraction of the teak occurs, the 291 is unable to expand/contract freely. Likely to come away at the side of the seam.

5. Do I just scrub the teak periodically or can I use some form of varnish? (eg. Le Tonkinois).
Each to their own. If you want a 'varnished' look, then you're in for a lot of work. Teak does not need any form of protection per se; anything you apply is cosmetic only.

6. Temperatures get rather high in summer (upper 30’s) and the UV Index is regularly 11+. Does this matter to the adhesive?
No.


All IMHO off course /forums/images/graemlins/smile.gif
 

PuffTheMagicDragon

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Thanks very much: that was quick! /forums/images/graemlins/grin.gif

When you say "Dow Corning 'marine adhesive sealant'" is there a specific product name or code that I should look out for?

Thanks once again!
 

cliff

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1. Is Sikaflex 291 suitable? Are there other alternatives that are less expensive?

Yes and Yes - I have used "Tiger Bond" on several jobs when relaying teak "decks" Basically any PU adhesive will suffice.

2. The Data Sheet for Sikaflex 291 says “may be used for light duty bonding”. How light is ‘light duty’? If I use it, will the planks stay put?

Yes, to the extent you will have one mother of a job getting the planks off in the future

3. What thickness of glue-line should I aim for when pressing the planks down onto the fibreglass? Is there a minimum?

Very little is required but I suggest you apply the adhesive with a notched scraper to ensure good bedding of the planks then wipe off the excess that squeezes out and reuse for the next plank

4. Since the ‘caulking' will be purely decorative, is it really necessary to put a bond-breaking tape down each seam?

Not essential, What is more important is treating the edges of the planks with sealer (super glue) before applying the caulking

5. Do I just scrub the teak periodically or can I use some form of varnish? (eg. Le Tonkinois).

Your choice

6. Temperatures get rather high in summer (upper 30’s) and the UV Index is regularly 11+. Does this matter to the adhesive?

No.

I suggest you have a look at the 'net for articles on replacing teak decking such as this one. It is relatively easy to do but difficult to do correctly without some background "tips and tricks"

Here are some to get you started
part I
part II
part III
or there is this and for a few more ideas there is this one

Enjoy
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PuffTheMagicDragon

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WOW!!!

I am certainly overwhelmed. Those links seem to be of the type 'All-you-wanted-to-know' - just what I needed to point me in the right direction and to give me a 'push-start'!

It takes me a while to get started but once I do start I usually do a decent job. (crosses fingers and arms and legs while apologising to the woodworking gods!!) /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Thank you so much!
 

cliff

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Only too happy to help - I have seen so many "nice boats" buggered up by their owner's cack-handed efforts at what should be simple jobs and all for the want of a few simple hints and tips. Please post the pics after you finish your little job.
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