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Recoating kite fabric

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foilholio
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Re: Recoating kite fabric

Postby foilholio » Wed Oct 23, 2019 7:53 pm

Sorry but not wrong at all. You are exhibiting what is common to feel some greater scientific knowledge in ignorance or maybe blindness to common facts, like is surrounding climate change. If the viscosity of air was greater than water you would be having a horrible time moving around. Have you tried walking in a pool? What you're stating is viscosity of air vs water based on mass, with volume then air is about 2 orders of magnitude less viscose than water.

I am not sure why water can not pass when air can, something to do with pressure and molecular forces. One example of a material that does this is Goretex.

Trust me you make a kite airtight not only will water not enter, but it will hold it's shape for longer and so relaunch will be much easier because of both effects.

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Re: Recoating kite fabric

Postby flying grandpa » Wed Oct 23, 2019 11:38 pm

foilholio wrote:
Wed Oct 23, 2019 7:53 pm
Sorry but not wrong at all. You are exhibiting what is common to feel some greater scientific knowledge in ignorance or maybe blindness to common facts, like is surrounding climate change.
If the viscosity of air was greater than water you would be having a horrible time moving around. Have you tried walking in a pool? What you're stating is viscosity of air vs water based on mass, with volume then air is about 2 orders of magnitude less viscose than water.

I am not sure why water can not pass when air can, something to do with pressure and molecular forces. One example of a material that does this is Goretex.
...
Air dynamic viscosity is ca 50 times greater than water. You can move in a pool and even easier in air due to 800 lower air density. 800/50=16 times easier.

IMHO goretex creates high water surface tension and that prevents water entrance. If you wash out impregnation, gortex no longer stay waterproof.
As a farmer I stay as close in touch with nature as you as a surfer.

Good sessions for you.
Tadeusz

nixmatters
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Re: Recoating kite fabric

Postby nixmatters » Thu Oct 24, 2019 4:53 am

Shall we please leave science aside and speak in kite relevant terms? ;)

It's about air permeability and water repellency/absorption.

Most of the textile wash in or spray chemistry will do the job. Wash in formulas will likely have less weight than sprays.

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Re: Recoating kite fabric

Postby foilholio » Thu Oct 24, 2019 6:47 am

One measure of viscosity detached from practically says water is thinner than air. It's like saying ice is thinner than melted butter. I am not sure of the usefulness without adding density to the equation.

From what I was reading goretex is a membrane with small holes. I would have thought water was repelled because of molecule size but water is one of the smallest molecules, smaller than most gases. I would guess the inter molecular forces are what surface tension is, causing the water to clump together and so not pass through holes it otherwise could. I guess under sufficient pressure those forces are overcome and water is passed through. Which would explain why waterproof things doing like watersports.

My advice and experience is chasing waterproofing is of little benefit compared to air tightness, and the nikwax etc wash stuff does not last and is really for waterproofing.

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Re: Recoating kite fabric

Postby wickedwim » Thu Oct 24, 2019 10:13 am

Since 4 years I use Ultramar kite refit coating. Every year I wash my kites with rainwater ( I heard tap water has to much chlorine), and then use a spray pump to coat my kites.
Since I coat them the kites have a lot less wear and tear, dry way faster, easier to sell secondhand, etc.

It is not cheap but worth the money in my opinion.


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