Re: [ATM] Moisture resistant baffles

["marco miglionico" <marco.miglionico@blueyonder.co.uk>]

I've been using neoprene sheets in flat matt black.
This stuff is excellent.

It's about 1.5mm thick, ultralight, 100% light blocking

Here is a U.K. link to some stuff (lots of sheet sizes - I got 1200x1000mm

http://www.homecrafts.co.uk/html/shop.asp?cat1=1&cat2=18

In Scotland we get a HECK OF A LOT of moisture, and this stuff seems
to perform o.k.


----- Original Message ----- 
From: "Jim Miller" <jim@jtmiller.com>
To: "ATM" <atm@atmlist.net>
Sent: Thursday, October 14, 2004 8:13 PM
Subject: [ATM] Moisture resistant baffles


> I did some work last fall on improving my baffling but haven't had time to
> implement it after some experiments nor put the info on my website. I
> thought I'd just pass it along now for those interested.
>
> I've been using black plastic corrugated sign board (CSB) (one brand is
> coroplast) for much of my baffling and attached it with industrial
strength
> Velcro. CSB has good stiffness but can bend if periodically slit along the
> corrugations which makes it useful for implementing curves. CSB is
> lightweight and impervious to moisture. It also isn't sharp when cut which
> makes it unlikely to cut you in the dark. You can find CSB in the US at
any
> home improvement, office supply, sign shop or plastic supplier. It's
pretty
> cheap. Lastly when finished for the night it can be removed and laid flat
> for storage if necessary. I put mine in my chart case.
>
> I found the surface a bit too shiny for my tastes, however, and sought to
> apply some flocking material to make it less reflective. My previous
> experience with paper backed flocking materials showed they work at first
> but when exposed to heavy dew tend to fail at the paper interface. John
> Sherman from the ATM list suggested Fidelio velvet from JoAnns fabric
store
> as a very dead choice. Since it is a polyester fabric it won't be affected
> by dew like paper backed flocking.
>
> After buying some I was then left with attaching it to the surface of the
> CSB. If you've every used CSB you know that not much sticks to it.
> Fortunately the industrial strength velcro sticks very well however. After
> doing a bunch of tests of various adhesives I found nothing that would
stick
> well to CSB and be easy to apply to the fabric. So I decided to go to a
two
> adhesive system as follows.
>
> First wash the CSB in soap and water to remove the mold release. Next
rough
> up the surface with ordinary sandpaper and remove the dust created. Thin
> some GOOP (home improvement stores in the US) with Toluol (home
improvement
> stores) until it is a syrup consistency. Paint the thinned GOOP on
roughened
> surface and allow to dry overnight.
>
> Next layout your fabric and paint the backside with Weldbond glue. Lay the
> fabric on the GOOP-primed surface, smooth out without stretching the
fabric
> and let dry.
>
> I've found this combo will resist separating to the point of destroying
the
> fabric when doing a pull test.
>
> Hope this is useful for someone else.
>
> jtm
>
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>
>

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