Fitting new windows without bolts

[seanfoster]

Hi All,

I have had new windows cut (perspex or equivalent) for my boat, I have gone for a larger window than the originals, I was thinking of using an alternative method (rather than through bolts or screws) to fix them into place using 3M VHB tape and a good flexible sealant.
This article inspired me: http://www.thecoastalpassage.com/windows.html

I've noticed a number of newer boats that appear to have their windows 'stuck on', has anyone done this, or anything similar?

 

[C08]

Works very well for cars. I suspect you need expensive/sophisticated adhesives designed for the surfaces glass/GRP/Polycarbonates etc with surface preparation being the key to success. I am watching this for feedback on peeps who have actually done this.

 

[seanfoster]

Works very well for cars. I suspect you need expensive/sophisticated adhesives designed for the surfaces glass/GRP/Polycarbonates etc with surface preparation being the key to success. I am watching this for feedback on peeps who have actually done this.

Well looking at the youtube videos about the strength of VHB, I shouln't have a problem, as you say the expansion issue is what I am concerned about.
I'm going to double up the thickness of the 2.3mm thick VHB tape and allow for a 20mm wide by 5mm thick seal with a high modulus sealant and see what happens!

 

[yoda]

Hi All,

I have had new windows cut (perspex or equivalent) for my boat, I have gone for a larger window than the originals, I was thinking of using an alternative method (rather than through bolts or screws) to fix them into place using 3M VHB tape and a good flexible sealant.
This article inspired me: http://www.thecoastalpassage.com/windows.html

I've noticed a number of newer boats that appear to have their windows 'stuck on', has anyone done this, or anything similar?

Sikaflex will make an excellent bond provided you follow their guidelines. Preparation, use of the right primers and the correct sealant are all vital. I found removing my old windows to be the devils own job, the leaks were round the screws. You also need to ensure that the thickness of sealant remains constant. Curved windows make this much more difficult. Good luck.

Yoda

 

[J Neeves]

Our windows are all glued in and have lasted 15 years so far, no bolts, no stews - just adhesive. Our windows have a huge overlap, like 100mm. I do not know the adhesive used, and it might have changed anyway but they used the same adhesive to glue the windows into the Petronas Towers in KL. So for inspiration look to the construction industry and as has been mentioned the automotive industry.

One key is - follow the instructions! One critical instruction is common - do not use turps, to clean prior nor after - it is a solvent for a large number of these adhesives (most of which set off with water (or moisture).


On another point raised - use piano wire to remove, it cuts through the sealant. You then need an 'acrylic chisel' (grind a sharp edge onto a piece of acrylic), it does not damage the gelcoat but will scrape the sealant - but keep the edge sharp.

Jonathan