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How to water proof cardboard?

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23 replies to this topic

#1 BKSo

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Posted 24 May 2022 - 07:33 AM

This is astronomical diy because I ride this bike to observe, 18km each way, with moderate climbing. Riding with all the astro gear is slow, so I came up with adding an aerodynamic fairing. Early tests were promising. I went observing last Sunday and managed 23.2 km/h average speed. 

 

94B6A58A-B625-472B-BDEA-89B7294CEA7A.jpeg

Now for the second phase of the project. Because the faring is made of cardboard (that is the only material I can work with) and I plan to commute with it, I need to make it water resistant. The only way I can think of is warping duct tape. I think you guys are more experienced on this and I better ask here what works and what doesn’t. Thx.

 


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#2 matt_astro_tx

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Posted 24 May 2022 - 07:40 AM

Paint.

 

If it's corrugated cardboard, duct tape all the edges, then paint it.


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#3 vtornado

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Posted 24 May 2022 - 08:46 AM

Im not sure if it water proof, but I use water based polyurathane, makes the cardboard stiff

and water "resistant"

 

I don't know if you are U.S. based, but during political season in the U.S.

there are thousands of yard signs for candidates.   They are made out of 

corregated plastic.  Very similar to corrigated cardboard, but it is a plastic substrate.

After the election this is a free material and is water proof.

It can be cut with a good pair of scissors.  

 

It is also available in craft stores


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#4 John Fitzgerald

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Posted 24 May 2022 - 08:55 AM

I have seen large dewcaps made of painted cardboard.  Duct tape the edges, or fill the edges with waterproof glue, then apply about three or four coats of exterior enamel paint.


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#5 BKSo

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Posted 24 May 2022 - 09:08 AM

Paint. I see. Thanks.

#6 KTAZ

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Posted 24 May 2022 - 09:09 AM

https://www.amazon.c...334&sr=8-6&th=1


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#7 John Fitzgerald

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Posted 24 May 2022 - 09:18 AM

Coroplast doesn't bend and form like cardboard.  Sharper bends tend to kink it.

 

Dampen cardboard just a bit, and you can form it without kinking.  Let it dry in the new shape, then seal the edges and paint it.


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#8 Jon Isaacs

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Posted 24 May 2022 - 09:20 AM

Bkso:

 

That's a pretty good ride.  I have ridden a lot of miles on bicycles, my concern with a fairing would be the wind, either from a passing car or truck or just a gust, it could really blow you are around. 

 

Jon


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#9 mrowlands

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Posted 24 May 2022 - 09:20 AM

When I was troubleshooting a leak in my car door, I found that standard duct tape (3M?) passes water through after it gets saturated.  A quality packing tape works fine.

 

Mike R.



#10 JamesMStephens

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Posted 24 May 2022 - 09:24 AM

Try Scotchgard.  I've used it on cardboard solar filter housings buit up from posterboard.

 

Jim



#11 SchoolMaster

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Posted 24 May 2022 - 09:26 AM

There are many other materials you could work with, with simple tools.  Cardboard is inexpensive, but not very robust.  Our students use it for a boat race each year, but it needs to be a lot more durable.  I'd look at Lexan, or similar, which can be cut with simple tools, glued, and it is transparent.  Our Middle and Elementary students use this material a lot. (We can laser cut it too)


Edited by SchoolMaster, 24 May 2022 - 09:26 AM.

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#12 cmanero

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Posted 24 May 2022 - 09:35 AM

You can get some clear contact paper (its is actually plastic sheet with adhesive on the back) which is fairly wide.  It would be like really wide duck tape.  3M sells it and it is available at Target or Amazon.  Amazon sells many different brands.  



#13 MarMax

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Posted 24 May 2022 - 09:45 AM

If you want to try something that soaks in and will get in all the edges, etc., and if you don't mind the smell of turpentine, you can use a 50/50 mixture of turpentine and linseed oil. This mix is liberally applied with a brush. It will soak in throughout the cardboard and will take a few days to dry. 

 

I've not tried this with cardboard. I've used this method many times with plywood that needs water protection.



#14 don clement

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Posted 24 May 2022 - 10:33 AM

https://www.westsystem.com/


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#15 PolyWogg

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Posted 24 May 2022 - 12:10 PM

I know someone who used a simple double wrap of Saran Wrap with duct tape around it. Between the two, it held for the card board item he had on a deck box. Not the "best", but it worked.

 

P.



#16 MitchAlsup

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Posted 24 May 2022 - 02:34 PM

Tung Oil



#17 gmiller123456

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Posted 24 May 2022 - 10:03 PM

For more ideas you might search for "cardboard kayak".  It's a pretty common competition and lots of ideas on how to waterproof the cardboard are thrown about.  Generally falls into either coating the cardboard in tape, or a waterproof paint.



#18 ccaissie

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Posted 25 May 2022 - 04:14 PM

Paint. I see. Thanks.

lotsa paint.



#19 careysub

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Posted 25 May 2022 - 04:22 PM

Don Clement's suggestion to coat it with epoxy is a good one (epoxy resin is go-to material for me), but another suggestion is to get a fiberglas repair kit like this one:

 

https://www.homedepo...-0420/205798047

 

And put a single layer of fabric on both sides. The kit uses polyester resin which is good enough for this. If you have the cardboard shaped properly as the resin sets it become a rigid, permanent form.



#20 Pinbout

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Posted 25 May 2022 - 04:48 PM

This is astronomical diy because I ride this bike to observe, 18km each way, with moderate climbing. Riding with all the astro gear is slow, so I came up with adding an aerodynamic fairing. Early tests were promising. I went observing last Sunday and managed 23.2 km/h average speed. 

 

attachicon.gif94B6A58A-B625-472B-BDEA-89B7294CEA7A.jpeg

Now for the second phase of the project. Because the faring is made of cardboard (that is the only material I can work with) and I plan to commute with it, I need to make it water resistant. The only way I can think of is warping duct tape. I think you guys are more experienced on this and I better ask here what works and what doesn’t. Thx.

get corragated plastics... 

 

like the green leaf bag chutes from Home Depot...


Edited by Pinbout, 25 May 2022 - 04:49 PM.


#21 jpcannavo

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Posted 25 May 2022 - 04:48 PM

I would try Plastidip. Can be sprayed

https://www.lowes.co...ment=4294698848



#22 rutherfordt

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Posted 26 May 2022 - 04:07 AM

I used paint-- several coats of an oil-based deck paint.  Its coming up on 20 years old or so and its doing fine.



#23 luxo II

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Posted 26 May 2022 - 07:31 PM

Use corrugated plastic "Corflute" or similar, available in 3mm or 6mm thickness, and a few colours.

Often used for realestate signs and election advertising.

 

To make a bend, use a craft-knife and a straight-edge to slice through one side, it will bend easily exactly along the slice. If you slice the flutes lengthwise,  it becomes very flexible perpendicular to the flutes (can be rolled up like a yoga mat), while remaining stiff along the flutes. Adhesive Velcro tabs adhere to it very well, which should suffice to attach it to your bike.


Edited by luxo II, 26 May 2022 - 07:32 PM.

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#24 BKSo

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Posted 27 May 2022 - 08:22 AM

Many good ideas. Thanks everyone :)

 

For now I am going to use paint and packing tape. I'd have to test this device for a few months. If then I decide I need it I would use corrugated plastics.




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