[Lab] Re Epoxy and fiber glass
jim kiskis
jim.kiskis at gmail.com
Wed Jul 13 22:57:17 EDT 2011
fron the bottom of the page
http://www.mickreevesmodels.co.uk/~mickreev/Access/accessories.htm
PRO-SKIN
PRO-SKIN is epoxy-glass sheet which has been moulded under high
pressure and heat. Result is a perfect flat
sheet with semi-matt surface which accepts paint and glues well. It is
waterproof and fuelproof, and will not warp.
When a model has been covered in PRO-SKIN, it will be ready to paint!
Gone will be the weeks or months of
tedious dusty work of rubbing down, messy resin/glass covering,
filling, more rubbing down and so on.
PRO-SKIN gives you a representation of a scale metal skin which would
be hard to achieve normally, and its instant!
When you add it all up, PRO-SKIN is not only MUCH quicker, it is also cheaper!
I did a check building a 9 foot span pair of wings,
Balsa sheet £35. 1120 gm
50 gm Glass cloth £15 135 gm
Epoxy resin £17 200 gm
spray filler £17 185 gm
sandpaper £7
Total cost £91 1640 gm
The cost of eqivalent area in 0.3 ProSkin - £84.
The proskin was a little heavier 1872 gm. but much stronger.
Use for Foam wings, instead of veneers.
Sheet is applied using Polyurathane adhesive. The adhesive has a
foaming action which
fills the slight irregularities in the foam. Leading edges and wing
tips are best made with balsa as normal.
Result is a hard surface ready to paint.
Wing is strong and stiff as it would have been with the normal
veneer/glass/epoxy resin finish.
Built up wings instead of sheet balsa.
0.2, 0.3, or 0.4 mm PRO-SKIN is used according to the size of the model.
The wing structure is sanded until all ribs and spars are level, just
as you would for sheeting with balsa.
The PRO-SKIN is cut with scissors slightly oversize. (One piece covers
the wing, no joining of sheets is needed).
Polyurathane adhesive is applied to the wing structure and the skin is
smoothed down and clamped or weighted.
The adhesive foams up to fill any gaps and also give a filleting
effect to make a strong bond with the structure.
The adhesive will be handleable in about 20 minutes, then the wing can
be lifted and the operation repeated for
the other side. The PRO-SKIN will only work where there is no double
curvature, so wing tips and leading edges will
be made in the traditional way. The PRO-SKIN is now ready for painting!
Alternative adhesive is one hour epoxy with some filler to thicken it.
This allows more time to position the skins.
It is good practice to slightly roughen the ProSkin suface at the glue joints.
Hunter wing with top skin fitted. Hunter flap only 6 mm
thick and completely rigid. Took 15 minutes to make.
Fuselages, small assemblies, ailerons etc, anywhere that a flat sheet
will fit. Perfect sharp and straight trailing
edges are easy with PRO-SKIN. Scale hinging for metal subjects now
becomes easy! Hinges can be fitted with our
tiny screws directly under the thin, hard PRO-SKIN sheet. Hatches?
Just cut the hatch in PRO-SKIN, place it on the
surface and mark around with a knife. Cut out, and line the hole with
narrow strip of PRO-SKIN glued inside. Place
the hatch into the perfectly fitted recess and secure with MRM ‘000 ’
tiny screws. Job done!
How?
Foam wings/tails/fuselage panels are covered in the thinnest PRO-SKIN,
using polyu glue.
You must prepare the job well before applying the adhesive to one side
of the foam, spreading with a scraper.
You must work quickly to get the PRO-SKIN in place within 5 minutes.
The inside of the skin can be dampened
if you want the adhesive set more quickly. The PRO-SKIN is then held
down with weights, or clamps and left to set.
Adhesives.
Polyurathane sticks very well to most things (even your fingers). It
is very convenient to fit formers in glass fuselages
because it needs no mixing. Just squirt it from the bottle over the
joint and it will form a natural, slightly flexible fillet.
Proskin will work with epoxy resins and cyanos. For an almost
unbreakable trailing edge, just apply normal cyano
so that it wicks between the wing skins. It will set in a few minutes,
then you will be able to knock the trailing edge
of your wing on the edge of your wooden bench. The bench will be
dented, not the wing!
Limitations.
As you might expect, being a perfect flat board, PRO-SKIN cannot cover
compound curves in one piece.
Most wing panels can be dealt with, and the leading edge is most
easily achieved with balsa in the traditional way.
Double curvature wings may be possible by slitting the PRO-SKIN near
the wing tip, but you must experiment with
this. Wings with a change in section, such as the Hunter or Javelin
will require a short slit at the front of the Proskin
You can be sure that many new techniques will be developed with this
new material when ingenious modellers get their hands on itl
polyurathane adhesive is very useful for all sorts of materials. It
needs no mixing, cures quickly and foams out to form
filleted joints.
PRICES
0.2 mm. - Foam wings and small models. 36" x 48" - £33.
Half sheet - £17. weight - 33 gm sq ft.
0.30 mm - Built up wings. 36" x 48"
- £33. Half sheet - £17 weight - 66 gm sq ft.
0.40 mm - Models.over 15 Kg 28" x 40" -
£22. Half sheet - £12 weight - 88 gm sq ft.
1.6 mm - horns and fittings. . 6" x 12" -
£5. Also 5 mm and 6 mm - £10 per square foot.
Please note that the thickness stated is nominal. The process cannot
control the thickness exactly and so this will vary.
.......................................................................................PRO-BOND.
... 500 ml,.... £10
On Wed, Jul 13, 2011 at 3:51 PM, John Nicol <john_nicol at hotmail.com> wrote:
> Hi Guys,
>
> Thank you for a great question (I have wondered that too and lots of Google
> searches gave me a lot of nothing about fibreglass suppliers in Ottawa!) and
> great responses! I have been so impressed by the resources that are tapped
> into by just being a member of artengine!
>
> I hate to spam the list with an inconsequential "woohoo". I promise this is
> the only one.
>
> ~:-)
>
>
>
> -----Original Message-----
> From: lab-bounces at artengine.ca [mailto:lab-bounces at artengine.ca] On Behalf
> Of lab-request at artengine.ca
> Sent: July-13-11 12:00 PM
> To: lab at artengine.ca
> Subject: Lab Digest, Vol 17, Issue 24
>
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> Today's Topics:
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> 1. Re: epoxy and fiber glass (mike Jans)
> 2. Re: epoxy and fiber glass (Michael)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 12 Jul 2011 13:17:30 -0400
> From: mike Jans <mjans at live.com>
> Subject: Re: [Lab] epoxy and fiber glass
> To: <lab at artengine.ca>
> Message-ID: <COL118-W4477B4A39F9D505517E09AD8440 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> There's a hobby shop in the train yards. I've bought both there.
> Mike
>
> Date: Tue, 12 Jul 2011 13:15:28 -0400
> From: audet.ma at gmail.com
> To: lab at artengine.ca
> Subject: [Lab] epoxy and fiber glass
>
> Anybody knows where I could get fiberglass and epoxy in Ottawa. Like a boat
> shop or plastic shop?
>
>
> _______________________________________________
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> Message: 2
> Date: Tue, 12 Jul 2011 13:19:59 -0400
> From: Michael <krazatchu at hotmail.com>
> Subject: Re: [Lab] epoxy and fiber glass
> To: lab at artengine.ca
> Message-ID: <BLU0-SMTP109D6C99C8B8DF055B8F9C5A6440 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
>
> Canus...
> http://www.canusplastics.com/
>
> Michael
> http://NoMiDesign.net/
> http://krazatchu.ca/
>
>
> On 7/12/2011 1:17 PM, mike Jans wrote:
>> There's a hobby shop in the train yards. I've bought both there.
>>
>> Mike
>>
>> ------------------------------------------------------------------------
>> Date: Tue, 12 Jul 2011 13:15:28 -0400
>> From: audet.ma at gmail.com
>> To: lab at artengine.ca
>> Subject: [Lab] epoxy and fiber glass
>>
>> Anybody knows where I could get fiberglass and epoxy in Ottawa. Like a
>> boat shop or plastic shop?
>>
>> _______________________________________________ Lab mailing list
>> Lab at artengine.ca http://artengine.ca/mailman/listinfo/lab
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>>
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