Tips on fixing perspex into a plywood cutout .

4 years ago
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elbows
elbows
23 posts
23 posts
20 Jun 2022 9:29pm
I've tried silicon , any suggestions before i fork out for the more expensive tubes of goo ?
Kankama
Kankama
NSW
829 posts
NSW, 829 posts
21 Jun 2022 7:00am
The perspex windows on my cat are held in by 6mm double sided tape and some Fixtech 200

www.whitworths.com.au/fixtech-fs200-low-modulus-silicone-black-310ml

This is the bees knees. Don't bother with sikaflex or others. Clean with meths, add the tape and squeeze into join.
woko
woko
NSW
1802 posts
NSW, 1802 posts
21 Jun 2022 7:54am
+1 fixtech
elbows
elbows
23 posts
23 posts
21 Jun 2022 7:46am
Thankyou , Sounds like the right stuff .
stray
stray
SA
325 posts
SA, 325 posts
21 Jun 2022 10:20am
Kankama said..
The perspex windows on my cat are held in by 6mm double sided tape and some Fixtech 200

www.whitworths.com.au/fixtech-fs200-low-modulus-silicone-black-310ml

This is the bees knees. Don't bother with sikaflex or others. Clean with meths, add the tape and squeeze into join.


What type of double sided tape do you use?
cheers.
Achernar
Achernar
QLD
397 posts
QLD, 397 posts
21 Jun 2022 8:52pm
elbows said..
I've tried silicon , any suggestions before i fork out for the more expensive tubes of goo ?


Bathroom Silicon, like MDF, is one of those materials that should NEVER, UNDER ANY CIRCUMSTANCES, get anywhere near a boat.

Fixtech is good, and actually does what you think it does.
Toph
Toph
WA
1890 posts
WA, 1890 posts
21 Jun 2022 8:44pm
stray said..

Kankama said..
The perspex windows on my cat are held in by 6mm double sided tape and some Fixtech 200

www.whitworths.com.au/fixtech-fs200-low-modulus-silicone-black-310ml

This is the bees knees. Don't bother with sikaflex or others. Clean with meths, add the tape and squeeze into join.



What type of double sided tape do you use?
cheers.


Andy from Boatworks (my goto YouTube channel) talks about a 3M tape. He also stresses that it's the tape that does the fastening.
woko
woko
NSW
1802 posts
NSW, 1802 posts
22 Jun 2022 7:26am
Toph said..

stray said..


Kankama said..
The perspex windows on my cat are held in by 6mm double sided tape and some Fixtech 200

www.whitworths.com.au/fixtech-fs200-low-modulus-silicone-black-310ml

This is the bees knees. Don't bother with sikaflex or others. Clean with meths, add the tape and squeeze into join.




What type of double sided tape do you use?
cheers.



Andy from Boatworks (my goto YouTube channel) talks about a 3M tape. He also stresses that it's the tape that does the fastening.


That's interesting, I used a couple of screws to hold the polycarbonate in place until
the fixtech cured then backed them out and filled the holes.
r13
r13
NSW
1721 posts
r13 r13
NSW, 1721 posts
22 Jun 2022 10:57am
Toph said..

stray said..


Kankama said..
The perspex windows on my cat are held in by 6mm double sided tape and some Fixtech 200

www.whitworths.com.au/fixtech-fs200-low-modulus-silicone-black-310ml

This is the bees knees. Don't bother with sikaflex or others. Clean with meths, add the tape and squeeze into join.




What type of double sided tape do you use?
cheers.



Andy from Boatworks (my goto YouTube channel) talks about a 3M tape. He also stresses that it's the tape that does the fastening.


Assume this is the video - 3M VHB tape to bond the window to the flat lip and then one of two Dow Corning silicones suggested for the surrounding gap. The FS200 should be just as good as the DC for the surrounds. Assume your ply will be totally epoxy resin sealed and then a primer and 2 pack polyurethane top coats to finish off? eg Norglass Shipshape and Northane.

www.boatworkstoday.com/videos/installing-new-fixed-portlights/

www.3m.com.au/3M/en_AU/vhb-tapes-au/
Kankama
Kankama
NSW
829 posts
NSW, 829 posts
22 Jun 2022 12:56pm
I don't use just the tape - I think it does the holding till the Fixtech hardens up. I would not like to use the tape and then just a non holding silicone. In fact in reality I still like a bolt at each end of my windows. My large windows have a bit of a curve in them and they can start to lift up at the narrower point, so a single bolt in the corners helps stop lifting and stops the windows falling off if the tape and fixtech let go. Strangely enough, the only problem I have with my setup is when the Wattyl Poly 400 polyurethane peeled off and the screws keep the window on until I get the time to rip the whole thing off, paint and redo.

But tape and fixtech is really good stuff - no leaks which is always nice.
Toph
Toph
WA
1890 posts
WA, 1890 posts
25 Jun 2022 2:52pm
Kankama said..
I don't use just the tape - I think it does the holding till the Fixtech hardens up. I would not like to use the tape and then just a non holding silicone. .

But tape and fixtech is really good stuff - no leaks which is always nice.


I don't think he is saying that the silicone doesn't have any holding properties. In fact his recommended product, Dow Corning 750 does have holding ability.

But having just looked at the price, if/when I tackle ti project, I'll be using FS200 too
woko
woko
NSW
1802 posts
NSW, 1802 posts
25 Jun 2022 7:13pm
Follow the fixtech directions as to scuffing, cleaning & black out procedures it will stick and be sealed. The overall appearance will dictated by the masking up and overall meticulously working clean, be prepared for the tape coming of the wet edge to be disposed of immediately into a bucket, otherwise you will have it every where, ( change gloves as soon as they get contaminated) and it does adhere to everything ! A little skill with the calking gun and pre planning will deliver a pro job
schwarz
schwarz
NSW
8 posts
NSW, 8 posts
27 Jun 2022 9:43am
I followed the method on Boatworks Today and it worked perfectly.
- Tinted perspex from Vale Plastics - 10 windows - $600
- 3M 5952 VHB Tape (Black - 1.1mm Thick) SKU: 3M 5952 Black VHB Tape-18mm - from embossing tape supplies - $178
- Dow Corning silcone - $8 per tube from glazing shop
- Black exhaust spray from hardware store for the trim

Once the windows were prepped it took about 1/2 day to do one side (5) and no leaks. I also used the same method on the hatches and the 10mm perspex had to bend a bit- just clamped it down until the tape cured.



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