Re-waterproofing canvas
Printed From: The Fishing Website
Category: General Forums
Forum Name: The Boat Shed
Forum Description: Discuss all things boating.
URL: https://www.fishing.net.nz/forum/forum_posts.asp?TID=127215
Printed Date: 28 May 2026 at 6:22am
Topic: Re-waterproofing canvas
Posted By: Kandrew
Subject: Re-waterproofing canvas
Date Posted: 11 Feb 2018 at 6:22pm
Ive got a black canvas canopy and have noticed in heavy rain in lets water through. Has anyone re-waterproofed their canopy and what have they used.
Cheers
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Replies:
Posted By: Tagit
Date Posted: 11 Feb 2018 at 7:38pm
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There are a bunch of products for tents that work just fine. Have used a few of them over the years and can't remember the brands sorry, but all the ones we have tried have worked pretty well.
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Posted By: Kandrew
Date Posted: 11 Feb 2018 at 9:24pm
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Sweet thanks for that, I thought that would be the best way to go.
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Posted By: Wefaknis
Date Posted: 11 Feb 2018 at 9:37pm
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303 water proof expensive but works well
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Posted By: ohsif
Date Posted: 12 Feb 2018 at 6:51am
You need to use a waterproofer for acrylic canvas, (like 303 Fabric Guard) not tent canvas waterproofer which is poly cotton canvas. 303 Fabric Guard comes in a spray bottle and only needs a light coating to work, don't make the canvas wet or you are just wasting the product (and money).It's a good idea to wash and dry the canvas first using a very mild soap or detergent.
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Posted By: Steps
Date Posted: 12 Feb 2018 at 8:43am
Mine is canvas.. tent canvas.
Gets a water proof every yr..its a 'maintenance' thing not a repair thing.
scot gaurd also works well as a protectant after the normal canvas water proofing..espec for protection against salt and bird poo.. leaf debris etc.
And a non bleach type disinfectant (gone in 60 secs concentrate @ 10%) in a spray bottle around stitching and behind where clears over lap.. canvas side.
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Posted By: ohsif
Date Posted: 12 Feb 2018 at 4:07pm
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Kandrew said his canopy was black canvas, almost certainly acrylic canvas. Any marine canvas work done by a reputable trimmer will be acrylic canvas, which has very different properties to poly cotton (tent) canvas.
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Posted By: Steps
Date Posted: 12 Feb 2018 at 4:16pm
Any marine canvas work done by a reputable trimmer will be acrylic canvas,
Mine is cloth type canvas, not acrylic or plastic coated/ impregnated, made by a very long established company been up for near on 7 yrs, all stitching in excellent condition.
Clears as clear as the day they where made.. The only things that have deteriorated are the velcro stitched to the roof for the screen clears hatch to fix back onto so dont flap in the wind when open ( bad idea in the 1st place)
And the upholsterers stitched on logo patch faded to nothing. Oh and the dark brown canvas colour has faded only slightly.
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Posted By: ohsif
Date Posted: 12 Feb 2018 at 8:55pm
Steps, you almost certainly have acrylic canvas. Poly cotton canvas shrinks up to 10% and fades badly if exposed to lots of UV. Acrylic canvas is used on most quality boat covers and outdoor furniture.
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Posted By: Betty Boop
Date Posted: 12 Feb 2018 at 11:17pm
My past company manufactured the solution in NZ (Penrose) I've used it many times satisfactorily. I'm about to redo my Black Canvas Canopy on my boat in situ when this weather clears. Will use a cheap. 180mm paint brush to apply. ...easy as☺
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Last week I joined an Anti-Social support group........They won't talk to me!
Papamoa
fi-Glass Viscount
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Posted By: Steps
Date Posted: 13 Feb 2018 at 7:39am
Steps, you almost certainly have acrylic canvas. Poly cotton canvas
shrinks up to 10% and fades badly if exposed to lots of UV. Acrylic
canvas is used on most quality boat covers and outdoor furniture.
OK how could one tell?
maybe burn a few fibres somewhere.. melt or smoke?
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