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Old 22nd January 2011, 01:06 AM   #21
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Hi SM7UYJ,

Don't use the thin double sided tape. It will not last long. The tape would stick to the Mylar well, but it will eventually give up strength on the other side. I have tried that many times and the longest time I can get out of it is 1.5 month.

Here is what I'm using. It's so far so good, but I can't guarantee. I use contact cement and thin double sided tapes. I apply a thin layer of contact cement on the spacer and wait for about 2-3 minutes and I put a layer of thin double sided tape on top. Then I glue the Mylar to the tape. I have been testing this method for the last 2 months and so far so good.

Wachara C.
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Old 22nd January 2011, 02:42 AM   #22
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THE REAL "BOATGLUE" I have found is used for veneer wood etc. it's based on 2 hydroxyl group phenol, resorcin in particular. Could you tell what's written on the can.
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Old 22nd January 2011, 03:32 AM   #23
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Quote:
Originally Posted by chinsettawong View Post
Hi SM7UYJ,

Don't use the thin double sided tape. It will not last long. The tape would stick to the Mylar well, but it will eventually give up strength on the other side. I have tried that many times and the longest time I can get out of it is 1.5 month.

Here is what I'm using. It's so far so good, but I can't guarantee. I use contact cement and thin double sided tapes. I apply a thin layer of contact cement on the spacer and wait for about 2-3 minutes and I put a layer of thin double sided tape on top. Then I glue the Mylar to the tape. I have been testing this method for the last 2 months and so far so good.

Wachara C.
I don't know of a double-backed tape that sticks well to PVC either but it wouldn't hurt to give 3M a call and speak with a tape specialist. There are many specialized tape formulations available and also brush-on primers that can promote adhesion to low energy surfaces (even Teflon can be etched and bonded). Just a thought....
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Old 22nd January 2011, 08:53 AM   #24
SM7UYJ is offline SM7UYJ  Sweden
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With the tapes I have tried, I get the weakest bond to the Mylar - It sticks like ..... to the PVC!? I'll have to do some more tests!

The "boatglue" (also said to be used in industry for cars, plumbing, construction - glues metal, concreate, wood, glas, some plastics etc.) is SMP-based, if that helps?

http://www.tremco-illbruck.se/celumd...SDS_S_4484.pdf

I tested it as it was the only construction glue they had that was black.
The glue is not resistant to solvents, soit could be removed if I need to take it apart some day.

For gluing the film to the spacers I have got hold off some Epoxi used to glue airplanes wich I'll give a try and se how well it sticks to PVC and Mylar!

/Roger
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Old 23rd January 2011, 02:21 AM   #25
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That's much better...
MS or SMP polymers are "siliconized" polyurethanes. Strong enough and flexible as well.
Nice find. It seems that sheer force of 16 kg per sm square is more than adequate to hold mylar film.
Again I have talked to marine people, who's been working with plywood and wood reparing and constructing boats yahts etc for ages. The boatglue is the staff waterproof plywood is made of (including veneer of course). Phenolic and resorcin resins...
Again NICE and USEFUL find. Thanks
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Old 24th January 2011, 06:49 AM   #26
SM7UYJ is offline SM7UYJ  Sweden
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alexberg: "Boatglue" was perhaps a bad name, but the sales person in the store sold me the stuff saying it was comonly used on boats!

The actual name translated is "Glue and construction sealant".

Anyway, it seems to bond well to the PVC and the powder coated stators.
I'll try to glue some Mylar this week and se how it holds.
First I'll have to glue one off my frames so I can mount the panel for proper testing.

/R
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Old 26th January 2011, 07:14 PM   #27
SM7UYJ is offline SM7UYJ  Sweden
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Started to mill the glued frames today.

Click the image to open in full size.

10mm deep, 15mm wide slot in wich I plan to place the panels.

Click the image to open in full size.

A smaller frame will be screwed to the back and help fixate the elements as well as help to stiffen the baffle.

/R
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Old 27th January 2011, 04:47 AM   #28
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Beautiful!
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Old 31st January 2011, 07:05 PM   #29
SM7UYJ is offline SM7UYJ  Sweden
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One frame for the back side glued and routed.

I now have to drill alot off holes and mount the "wing" - then it's finaly time to mount the panels!

Click the image to open in full size.

/R
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Old 1st February 2011, 03:57 AM   #30
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That looks nice!

Wachara C.
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