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On the subject of Gel Coat and go faster coatings
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Paramedic View Drop Down
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Posts: 929 		Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Topic: On the subject of Gel Coat and go faster coatings
    Posted: 23 Sep 21 at 7:37am
Originally posted by fab100

It appears GRF's go-fast bubbles finally may be a go-er:

“Carpets of bubbles” will soon save shipping giant MSC £220m in fuel costs after it signed up to put a British company’s revolutionary technology on a fleet of new cargo ships.

MSC will install Silverstream Technologies’ “air lubrication” design on 30 container ships it has ordered from southeast Asian shipyards."

https://www.telegraph.co.uk/business/2021/09/22/carpets-bubbles-slash-fuel-costs-container-ships/




Coming soon to a wayfarer near you  LOL
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fab100 View Drop Down
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Posts: 1005 		Post Options Post Options   Quote fab100 Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 21 at 2:47pm
It appears GRF's go-fast bubbles finally may be a go-er:

“Carpets of bubbles” will soon save shipping giant MSC £220m in fuel costs after it signed up to put a British company’s revolutionary technology on a fleet of new cargo ships.

MSC will install Silverstream Technologies’ “air lubrication” design on 30 container ships it has ordered from southeast Asian shipyards."

https://www.telegraph.co.uk/business/2021/09/22/carpets-bubbles-slash-fuel-costs-container-ships/
Great book for Club Sailors here
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iGRF View Drop Down
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Posts: 6499 		Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 21 at 1:56pm
OK, so I have an update, this is a new Durepox Extreme version even tougher and slippyer, will report more news when I have it, have also come across an incredible new foam that withstands amazing loads yet is almost as light as EPS it's being used by a new Surfboard manufacturer called Appletree who's boards we now rep over here. Interesting the march of development still continues. Lots of exciting development coming out of Portugal of all places thanks to massive EU investment.

Edited by iGRF - 14 Sep 21 at 1:56pm
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iGRF View Drop Down
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Posts: 6499 		Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 10 Sep 21 at 6:25pm
Originally posted by aardvark_issues

There's Durepox and there's Durepox. The Moths have been using Durepox primer for foil finishing since forever - you've got a nice few days window from spraying to flatten back to a smooth finish before it goes really hard. 
The Durepox topcoat I think has PTFE in it if I remember rightly. Also goes pretty hard and I'd probably use it over a 2 pack polyurethane or 2k car paint. Done a couple of boats with it and it's nice enough.


This stuff is pretty new, so I've probably got the name wrong, whatever it is they are interested enough to ask for stickers for the speed record attempt, I'll try and find out more, might see him at an event tomorrow.
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aardvark_issues View Drop Down
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Posts: 505 		Post Options Post Options   Quote aardvark_issues Quote  Post ReplyReply Direct Link To This Post Posted: 10 Sep 21 at 4:04pm
There's Durepox and there's Durepox. The Moths have been using Durepox primer for foil finishing since forever - you've got a nice few days window from spraying to flatten back to a smooth finish before it goes really hard. 

The Durepox topcoat I think has PTFE in it if I remember rightly. Also goes pretty hard and I'd probably use it over a 2 pack polyurethane or 2k car paint. Done a couple of boats with it and it's nice enough.
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fab100 View Drop Down
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Posts: 1005 		Post Options Post Options   Quote fab100 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 21 at 4:34pm
Originally posted by davidyacht

Who remembers Smoothy?

Me

Never found it as easy to sand flat as they claimed and found it cracked on my Mirror until the bottom looked like crazy paving. Cute Mr Sheen story
Great book for Club Sailors here
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PeterG View Drop Down
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Posts: 822 		Post Options Post Options   Quote PeterG Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 21 at 9:25am
I loved the Grafspeed in the bottom of my mirror back in the 60s. As Sam says, the big advantage was that is was easy to sand very smooth - and unbelievably messy to do.

But it was also great at absorbing the rays when it was sunny. I made the mistake of leaving it upside down for a week one summer and when I came back it had blistered up all over.
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 21 at 5:42am
Yes paints have come a long way from those systems. The epoxy high build surfacers allowed you to get a lot of paint on in one go. Let it dry overnight-flat it back the next morning (really easy as it was still not very cured). It would then cure off over the next days giving a hard fair base for a top coat. It is easy to get a good finish with minimal work involved.
On the “bubbles “ thing sounds like what the Ruskies are doing with their latest hyper speed torpedo-it has a gas generator so it travels in its own bubble ,allowing it to go super fast ( allegedly!)
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Posts: 3400 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 21 at 11:15pm
Grafspeed and the Helmsman white stuff worked simply 'cos it was easy to get a very smooth and fair finish with it. I used grey hi-build cellulose primer on my Div 1 boards to achieve exactly the same effect. Not sure it was faster but the grey dappled finish on my Superlight was great for psyching out the opposition  Wink.

the 'bubbles' thing was possibly a reference to the extruding polymers applied to some boats back in the day before it was banned?
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 21 at 7:57pm
https://www.sciencedaily.com/releases/2016/09/160902125334.htm
Got to be big bubbles according to this paper, can reduce friction by 20%

Edited by 423zero - 06 Sep 21 at 8:00pm
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