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Old 09-08-2018, 21:23   #1
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Flow coat wrong catalyst ratio

Unfortunately we misunderstood the ratio of catalyst to flow coat... And just painted our engine bay at 2ml catalyst per litre flowcoat. Correct ratio should be 20ml. What is the consequence likely to be here? Only happened yesterday but the boat is 2hrs flight away... Flowcoat was still tacky when we
left today.
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Old 09-08-2018, 21:34   #2
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Re: Flow coat wrong catalyst ratio

Hmmm, 20 ml catalyst per litre seems a awful lot, indeed it is more like 2 ml per litre, but then again I do not know your supply and brand.
Well, if your assumed ratio was correct, then it will take a looong time to cure, but cure it will. Wait for a couple of days of warm/hot days, but as your summer is months away.... help it with a heater. Heat will speed up the curing.
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Old 09-08-2018, 22:39   #3
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Re: Flow coat wrong catalyst ratio

I understand that it should be mixed at 2 percent catalyst. So that would be 20ml per litre...right. We put 2ml per litre...
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Old 09-08-2018, 23:36   #4
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Re: Flow coat wrong catalyst ratio

Long ago I had a similar oops event. Found that IR heat lamps and a little patience made up for the missing catalyst. Good luck!

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Old 10-08-2018, 00:40   #5
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Re: Flow coat wrong catalyst ratio

Thanks Jim. We're really annoyed at ourselves. It would be great if we had a solution as simple as that. We're in the marina so could blow a fan heater over it.
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Old 10-08-2018, 02:02   #6
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Re: Flow coat wrong catalyst ratio

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Originally Posted by nzmal View Post
Thanks Jim. We're really annoyed at ourselves. It would be great if we had a solution as simple as that. We're in the marina so could blow a fan heater over it.
depending on temperature 1% is about the minumum for a full cure at 20 Centigrade,if the room temp is around 30C or higher you might get away with less.

if it is still tacky when you get back,wipe down with acetone to remove thicker pools of resin and recoat on top,using smaller batches of flocoat catalysed at 3-4%,work fast as it will gel quickly,but this should cure what is underneath.

failing that a scraper,clean rags and acetone ,remove the uncured flocoat,then start again
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Old 10-08-2018, 08:34   #7
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Re: Flow coat wrong catalyst ratio

Just recoat it with another “hotter” mix. Maybe thin it with the proper thinner for better penetration
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Old 10-08-2018, 09:37   #8
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Re: Flow coat wrong catalyst ratio

If you just let “dry” as is it may eventually dry to the touch but will never have the properties it is supposed to. It will collect grease and dirt and be more difficult to wipe clean not to mention not a very good base for any future paint job.
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Old 10-08-2018, 14:21   #9
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Re: Flow coat wrong catalyst ratio

Jim is right,,,infra red heat lamps. Guarantee it WILL set up.



Do NOT paint more catalyst or a "Hot" mix over it.
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Old 10-08-2018, 16:25   #10
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Re: Flow coat wrong catalyst ratio

If your coat is epoxy or vinylester, the hardener mix is crucial and sounds like 20 mls/litre. I would contact the manufacturer for advice--maybe it is possible to paint on some hardener and complete the cure--but I doubt it. I think it may have to be washed off with detergent.

If it is polyester--it will probably cure. Eventually.
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Old 10-08-2018, 18:33   #11
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Re: Flow coat wrong catalyst ratio

Ok so infra red heat lamps sound promising... How does this work though?
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Old 10-08-2018, 18:47   #12
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Re: Flow coat wrong catalyst ratio

Another vote for heat lamps. The sooner the better.
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Old 10-08-2018, 18:49   #13
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Re: Flow coat wrong catalyst ratio

^^ by heat. Warming the resin will make is cure faster so in your instance it might have taken weeks to cure, it will only take days when it is warmed up some.
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Old 10-08-2018, 21:27   #14
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Re: Flow coat wrong catalyst ratio

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Ok so infra red heat lamps sound promising... How does this work though?
If you mean how to go about their use, well, you plug them in and point them at the subject surface from a foot or two away. They warm the surface up and that helps the polymerization process along. The main purpose of the catalyst is making an exothermic reaction and heating the flowcoat enough to get the process going.

Some folks doubt the usefulness of this method... I suggest that it is easy and will not make the situation worse. Additional hot coats or other chemical methods do have some nasty failure modes, but sometimes succeed. Other times, not so much, and the resulting mess is prodigious!

First, do no harm!

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Old 11-08-2018, 01:14   #15
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Re: Flow coat wrong catalyst ratio

we only use epoxy flow coat on our 100+ year old boat which 3 - 1 catalyst resin ratio. it sounds like you are using polyester flow coat which uses a 2% resin - catalyst ratio. if you have that ratio wrong you can mix to the correct ratio and apply to the whole area over the top of it being careful not to miss anywhere and it will cure. no guarantees because there are too many variables. we are sitting in a small yacht on the east coast of Australia. we don't use polyester on anything wooden that floats on the water
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