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Post by smiles on Feb 6, 2008 22:21:39 GMT 10
Hi all
I'm sure there's info somewhere, but can anyone tell us what's the best paint, oil-based undercoat or acrylic undercoat for the canvas overcoat on the van's plywood roof. It's already been painted about 20 years ago with acrylic paint, and we thought we would carefully sand off the canvas area to key the paint in. The canvas looks delicate and the existing paint is powdering rather than cracking like it is on the plywood sides of the van.
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Post by Deleted on Feb 7, 2008 6:48:27 GMT 10
Hi Smiles
There is a roofing paint on the market called emaclad. Its a water based product that drys flat without any shine. It is a very good product that expands and contracts with extremes of temp. However i am not sure if it comes in anything less than 20 litre drums or anything other than white.
Second alternative. Is Be very careful and give the roof a light sand with something no finer than 120 grit sand paper then give the roof 2 good thick coats of oils based exterior grade ( Dulux weathershield ??) enamel in your choice of colour. What ever you do do not disturb/rip/ tease up the canvas unless you have to repair a patch that has been torn.
If you do make a mess of it the only way to ensure that you dont invite leaks in the roof is to remove the lot and start from bare timber/ primer/undercoat/ top coat again.
Others may challenge this approach . Just me yapping from experience with bondys that have canvas roofs. There is more than one way to skin a cat . Just ensure you dont mess with the origianl canvas and sealer too much.
Reddo
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Post by willyn on Feb 7, 2008 21:41:26 GMT 10
Hi there vin van peeples if you need a product to stop around twenty degrees of heat penetrating your caravan through the roof (dinkum) we have the official testing charts this product protects hundreds of millions of dollars of Grain It stops the grain from overheating and creating fungus and moulds forming it has a life of around fiteen years compared to paint at 5 years the product is a hi build 100% acrylic Membrane that can be rolled or sprayed for a good finish we use it for spraying Grain Silos and Metal Deck roofs and Tile roofs with This product is perfect for sealing any timber canvas metal or aluminium I use it on a daily basis I am painting the roof of Lord fred with it I can batch it down from twenty litre drums to four litre lots if any one require the product you will need an etch binder which can arranged at cost as well the retail price of the product is $70 dollars for 4 litres I can get it for $45 dollars for 4 litres plus post as previously stated the life is around fifteen years or more and reduces heat by around 20 degrees as tested on aluminium panel these silos are resprayed every ten to fifteen years any more info required contact Will
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Post by smiles on Feb 8, 2008 15:30:48 GMT 10
Thanks Will n Reddo The canvas is glued/bonded onto the plywood roof, & the van is also lined with plywood. So we're not sure yet if we need the Silo treatment. We were hoping to do all the same paint over the whole lot externally. I checked out that EWPAA website and they seem to recommend all acrylic (primer & topcoats) for the flexibility of plywood. BUT Reddo, there's no substitute for experience!
I'll try & get this photobucket thing together n send a photo. Thanks
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Post by diyman on Feb 8, 2008 18:26:52 GMT 10
Hi Willyn
How would that paint go on a worn old ply roof with cracks in the surface would it seal the cracks.??
Jim
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Post by willyn on Feb 8, 2008 23:22:57 GMT 10
hi diyman the product is thick and will cover your situation as long as you roll or spray on around two or three coats letting each coat dry thoroughly
Will
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Post by minicamper on Feb 12, 2008 6:40:55 GMT 10
Hi Smiles,
If I were you, I'd go for Will's suggestion. Insulation properties aside, anything that lasts a long time has got to be a better option. The only problem with enamel paints is that they go brittle and crack after a period of time, particularly when exposed to the sun. They are also fussy about what you put them over unless you use a sealer primer first. This is one reason why the paint companies are moving to acrylics, unfortunately they haven't mastered getting the same level of gloss yet (not that you'd care on the roof) Being somewhat inaccessible (unless you're VERY tall) I'd do the job once and not want to worry again for a while.
Cheers Chris
P.s I'm yet to see any exterior paint make it to ten years yet..
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Post by smiles on Feb 20, 2008 21:26:38 GMT 10
Hi Will I've been away in Melbourne & just got back. Is the silo paint glossy, matte or semi-gloss? What colours do you have? Does it dry hard? What happens when you come to re-paint the roof in 10-15 years, is it easy to sand back & key in the next coat? Wouldn't you only need an etch binder for a metal roof? Would the silo paint go on over the canvas roof after a nice careful sanding, as suggested by Reddo? Maybe you can send me a PM with your location so we can work out what freight might be like.
Thanks Cathie
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Post by willyn on Feb 20, 2008 22:23:20 GMT 10
Hi smiles The product is matt and it is a longlife Coating that should give you around twenty years service it can be painted over and the colour diminishes the heat effectiveness eg black is attracts heat white reflects heat so shades in between vary to how effective the product is my tiled roof at 300 micron in white stops around 25 degrees of heat penetration in my roof space
Will
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