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Old Jan 02, 2016, 03:37 AM
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Question
Strong Clear Coating for Foam

I thought that using the Minwax Polycoat would give my EPS / Styrofoam plane the needed strength to resist dents. Sadly it is not true. My foam plane is even more susceptible to dents. I was doing some work on my plane at the kitchen table and one of the servo wires got under the fuselage. Just the weight of the plane resting on the servo wire made a very clear impression in the foam. Needless to say I'm very disappointed. Is there any strong clear coating material either spray or film that I could apply that would give the planes surface more strength to resist dents?
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Old Jan 02, 2016, 05:57 AM
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Quote:
Originally Posted by notime_3001 View Post
I thought that using the Minwax Polycoat would give my EPS / Styrofoam plane the needed strength to resist dents. Sadly it is not true. My foam plane is even more susceptible to dents. I was doing some work on my plane at the kitchen table and one of the servo wires got under the fuselage. Just the weight of the plane resting on the servo wire made a very clear impression in the foam. Needless to say I'm very disappointed. Is there any strong clear coating material either spray or film that I could apply that would give the planes surface more strength to resist dents?
You have to use something like paper or fiberglass with the Minwax.
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Old Jan 02, 2016, 06:19 AM
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Sadly , nothing makes foam crash-proof , ding-proof ... Careful flying actually works better than anything ...
Clear packing tape is a good protector for minor things ..
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Old Jan 02, 2016, 09:16 AM
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I always just use clear packing tape, but it is not as dent resistant as what I believe you are looking for.

I would like to give this stuff a try some time:

Foam Finish from Beacon Adhesives Review (5 min 12 sec)


Maybe you can try this and report back here what you think?
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Old Jan 02, 2016, 09:19 AM
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Old Jan 02, 2016, 12:07 PM
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Alternates :-)
http://www.horizonhobby.com/foam-armour-dlmbd50
And;
http://www.industrialpolymers.com/pr...rospray-series
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Old Jan 02, 2016, 12:25 PM
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What about something like this?

Hot Wire Foam Factory Exterior Foam Coat
Link: http://amzn.com/B00EOSNEAM
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Old Jan 02, 2016, 07:08 PM
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The Foamie Trailer folks discussed that and it was thought to be "too good to be true" ,and very Expensive , and likely too heavy for our plane use ... Much skepticism about the promises made ...
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Old Jan 02, 2016, 07:14 PM
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Never have been able to see little dings in my planes when they are flying.
Even more so with FPV...
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Old Jan 02, 2016, 07:18 PM
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Foamys are susceptible to weight variations.

My neighbor built two Judi's and can really tell the difference between them
as one was built tough and Pretty and the other much Lighter and less "decorated" .

My point is simple minded .
Foamys are supposed to be cheap light and expendable.

All this newspaper and glass covering and overcoating with paint etc is just going to implact performance and delay getting into the air
WHERE, as Whiskers said , just above here ...

Ya kan't see the blems any time after takeoff.
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Old Jan 02, 2016, 07:42 PM
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Quote:
Originally Posted by birdofplay View Post
Foamys are supposed to be cheap light and expendable.

I disagree. I think they can be whatever you want to dream up. No reason to put them into a box.

The foam planes I build are on the heavy side, extremely fast, and last a long time. But you've got one thing right, they sure are cheap :-)
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Old Jan 02, 2016, 07:43 PM
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Quote:
Originally Posted by birdofplay View Post
Foamys are susceptible to weight variations.

My neighbor built two Judi's and can really tell the difference between them
as one was built tough and Pretty and the other much Lighter and less "decorated" .

My point is simple minded .
Foamys are supposed to be cheap light and expendable.

All this newspaper and glass covering and overcoating with paint etc is just going to implact performance and delay getting into the air
WHERE, as Whiskers said , just above here ...

Ya kan't see the blems any time after takeoff.
I've " experimented " with coatings , coverings , etc. , mostly on the plane I make most often - the EzFly - so I can compare differences . One EzFy I covered entirely in doculam - it flew like ! The best flying planes are the ones kept LIGHTWEIGHT , and they look BEAUTIFUL when flying !
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Old Jan 03, 2016, 03:17 AM
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note.... a lot of dents can be removed , either by using the steam/heat from a kettle or by using a modelling iron , they just pop back out,

multi layers of foam are stronger than a thick single layer

tape over is good , it adds a bit of weight.. decoration/colour and being tear resistant it adds strength.. however it still lets the foams get a bit dented

Ironed on laminating film is the toughest material, far stronger and tear resistant, and even heavier.
There is nothing wrong with heavier, it just means your model will have to be flown that bit faster..

any strengthening protection is going to add weight...
so its a trade off..
a light model might fly somewhat better, but that's no use if it doesn't last 5 minutes...

I mostly use a combination of layers with tape coverage... KF wings for multi layers, with 2" packing tape for protection..
the models last ok , they are often only disposed of when I need the room for a new build..
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Old Jan 03, 2016, 06:23 AM
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Not to worry .... There have always been two schools of thought here ... Light and simple , and heavy and “crash resistant” ... No use trying to convince the other side , they seem very resistant to Logic and experience ..
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Old Jan 03, 2016, 07:52 AM
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GPW, the peacemaker and diplomat as always :-)

My intent was not to be antagonistic but to proffer another viewpoint or philosophy.

I think it was ~ 10 yrs ago when I asked GPW about "the Foamy Philosophy"
as I was trying to get a grip on Foamy designing and uses versus my yrs
of building with balsa and ply.
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