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Cheap knit material that is waterproof? or a way to make a knit material (like "tee" shirt fabric) waterproof? Answered

I am designing a cover for a kayak and having a stretchy, waterproof cover would make the other parts of the design a whole lot easier.

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drdunc1000
drdunc1000

Answer 11 years ago

I almost tried this.  I was at the store and tried to decide between two different brands - wound up forgetting to buy either one of them.  Next time I'll remember!   Who is Tim?

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drdunc1000
drdunc1000

11 years ago

I tried out the liquid latex (Casting Craft's Mold Builder-obtained from A.C.Moore) and it seems the best choice.  Not only does it work on the fabric (both unstretched and pre stretched) but I can use it to do molding of small parts. Right now I am making some cheap sprockets using epoxy and a mold I made from a nylon sprocket.

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gearhead1951
gearhead1951

11 years ago

buy a wax ring used for sealin' a toilet to its base and rub th' wax into th' fabric

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drdunc1000
drdunc1000

Answer 11 years ago

Is the melting point of the wax high enough that it won't be affected by the sun?

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gearhead1951
gearhead1951

Answer 11 years ago

th' sun wiil quite likely melt th' wax ,  but that just means th' fabric will remain pliant ,  once you have it saturated ,  it will only bleed out so much and then stay waterproof !

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Burf
Burf

11 years ago

Could you use Tyvek with elastic in a gathered edge?

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drdunc1000
drdunc1000

Answer 11 years ago

Tyvek is probably the cheapest alternative and I could probably get a local contractor to give me his scraps.  Do you know if it will tear if I try to sew pieces together.  Or is this the wrong way to do this?

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Burf
Burf

Answer 11 years ago

The best way to join it together is with contact cement.  I've used this method with good success.
I think sewing it would weaken the Tyvek along the stitches, tearing through when put under a strain.

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AngryRedhead
AngryRedhead

11 years ago

Why not use neoprene?  It seems you can get it somewhat inexpensively on eBay.
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drdunc1000
drdunc1000

Answer 11 years ago

Would this be cheap enough?  If so this would be the best.  Am I correct in assuming that it holds up to light okay?

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AngryRedhead
AngryRedhead

Answer 11 years ago

Quality fabrics are expensive.  Jersey (t-shirt material) is a very cheap fabric but won't hold up for an application that you're wanting to use it for.  Neoprene is the material they use for scuba suits, and I'm pretty sure it's the same material used for spray skirts.  I don't know much about the material, but it's definitely a point to research and decide if it's right for what you want to do.
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RavingMadStudios
RavingMadStudios

11 years ago

Paint the whole thing with Plasti-Dip. It even comes in cool colors.

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drdunc1000
drdunc1000

Answer 11 years ago

I've got some of this at work.  I'll give it a try and let you all know the results.