Dai Fledermaus Posted July 31, 2013 Share Posted July 31, 2013 I'm another one who used Aerokote for the first time recently. I used the correct mix, but it took almost a week to harden even in the recent hot weather. I'm about to give it a second coat, in light of your comments it will be interesting to see what happens. Quote Link to comment Share on other sites More sharing options...
stuey Posted July 31, 2013 Share Posted July 31, 2013 What ratio did you use Colin? Quote Link to comment Share on other sites More sharing options...
Dai Fledermaus Posted July 31, 2013 Share Posted July 31, 2013 Stuey, I followed the instructions ie about 35drops of catalyst to 25 ml of Aerokote. I started to brush it on as quick as I could expecting to harden as quickly as glass fibre resin, but I needn't have bothered because it was still tacky for several days. Glad I wasn't temped to try and remove it during that time, would have made a right old mess of it. Quote Link to comment Share on other sites More sharing options...
stuey Posted July 31, 2013 Share Posted July 31, 2013 Hmmm I think I will try 40 drops per 25ml on my test piece. Quote Link to comment Share on other sites More sharing options...
Dai Fledermaus Posted July 31, 2013 Share Posted July 31, 2013 Second coat applied this afternoon. Used half the quantity but kept the ratio the same. After about two hours it was almost dry. Don't ask! Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted November 1, 2020 Share Posted November 1, 2020 I just found this thread from a while ago and noticed the exact same problems with acid catalysed PU, this time though it was Sadolin PV67. Being reluctant to try it on a model without testing it first, I mixed a small batch to try and I brushed it onto a few cans and jar tops. I had the same problem of it not going hard although it wasn't sticky it could easily be removed with a thumb nail after leaving a few days to set. I even put a test piece in a UV chip eraser to see if the theory about UV cross-linking was true but it made no difference. Next I made up a batch and added about 15% hardener instead of the 10% as instructed this made a dramatic difference. I seems like the acid catalyst is somehow weaker than it should be. If it can be trusted to set properly it should make a great fuelproofer with a really glossy finish which self levels from brushing so no need to spray. The advantage with this kind of chemical is that the pot life is much longer then the setting time once painted on the the surface so I will always test the mix on a piece of scrap and see how it hardens before applying it to a model. Quote Link to comment Share on other sites More sharing options...
gangster Posted November 2, 2020 Share Posted November 2, 2020 I wonder if they have played with the formula. Years ago I used tuffcote which was a similar 2 pack system. Furniglass hardset was Probably the same stuff. Furniglas seemed to disappear and tiff core was changed. I believe it was a nasty chemical issue. The new tiff vote was fine but I think ripmax discontinued it years ago. I have since used aerocote and had no issues with it apart from the fact it would not stick to some paints . acrylic I believe.Tuffcite and aerocote are the only products that I have found truly fuel proof. Now it looks from this that they have changed it. Being a savage I have never been scientific in the mix with no issues Quote Link to comment Share on other sites More sharing options...
Former Member Posted November 2, 2020 Share Posted November 2, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Stuart Z Posted November 2, 2020 Share Posted November 2, 2020 Posted by Ian Jones on 30/07/2013 17:13:03: Slightly off the original subject but still a problem I had when I tried aerokote - the vapours. I applied it by brush in my garage with the up & over door fully open. I was about 5 feet from the opening but still ended up feeling sick and dizzy. I'd like to use the rest of it but I'm very reluctant - how does eveyone else deal with this? Ian Reading back on this thread - this is may be a high VOC product which suggests a mask of the right type may be necessary. I’m no chemist or even an expert on the subject but learnt the hard way. I used an unrelated high VOC product indoors a couple of years back and it triggered a 2 month long asthma episode. Not a good place to be. My guideline now is to use water based products only. It creates a few challenges but I use such as Ronseal Diamond hard varnish. It sprays well and is water based. S Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted November 2, 2020 Share Posted November 2, 2020 Posted by Doc Marten on 02/11/2020 13:54:59: Did you mix by volume or weight? Doc, I mixed by volume as you are supposed to. In the pack you get 1litre of resin and 100ml of hardener which makes it difficult to use the whole pack. I did however add the extra hardener from some spare from an AeroKote kit which made it set as it's supposed to. Edited By Andy Stephenson on 02/11/2020 21:53:26 Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted November 3, 2020 Share Posted November 3, 2020 ... Reading back on this thread - this is may be a high VOC product which suggests a mask of the right type may be necessary. I’m no chemist or even an expert on the subject but learnt the hard way. I used an unrelated high VOC product indoors a couple of years back and it triggered a 2 month long asthma episode. Not a good place to be. My guideline now is to use water based products only. It creates a few challenges but I use such as Ronseal Diamond hard varnish. It sprays well and is water based. S Stuart, were you spraying or brushing the high VOC product that triggered your reaction. A. Quote Link to comment Share on other sites More sharing options...
Stuart Z Posted November 3, 2020 Share Posted November 3, 2020 Andy, Brush painting, it must have have been caused by the evaporating vapour. There was no spray involved S Quote Link to comment Share on other sites More sharing options...
Pete Collins Posted November 3, 2020 Share Posted November 3, 2020 As I recall, the old Tufcote product was a Urea Formaldehide resin - Nasty stuff - I'm not surprised that they discontinued it! Quote Link to comment Share on other sites More sharing options...
Former Member Posted November 3, 2020 Share Posted November 3, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
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