Is regular polyurethane fuel proof???
08-27-2003 | 01:02 AM
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From: usa,
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Is regular polyurethane fuel proof???
It has been a long time sice I built a warbird with a 4 stroke engine in it. I want to clear coat it. I have plenty of regular clear polyurethane around. Is regular polyurethane fuel proof to glow fuel???? I know it would yellow a little....
Ty
Ty
08-27-2003 | 05:18 AM
#3
Is regular polyurethane fuel proof???
Howdy,
From 1974 until 1996 I used Castor-based, 5% nitro fuel. Most of my models were painted in silver cellulose with top colours in Humbrol enamels, sometimes other brands of enamels. All models were fuelproofed with airbrushed single shot polyurethane varnish, manufactured over here by Rustin's ( and a few times by other manufacturers). 2 coats gloss, 1 matt if required. With this arrangement I had no problems, even with neat fuel.
In 1996 I changed fuel to synthetic-based (ML70 oil) with 2 or 3% castor, 5% nitro (I started using 4-strokes as well as 2-strokes and this fuel suits both). Since starting to use this, the finish of the models deteriorated - all the colour coats bubbling up and stripping off.
I now use a fuelproofer marketed by Ripmax known as Tufcote - I understand this is a lacquer - it is 2 part. (As before 2 coats gloss, 1 matt if required). It seems impervious to the fuel I now use. the only problem is that it is thinned with cellulose thinners & sprayed onto enamels, but in approx 9 years I have experienced no problems(yet!).
I was told that the ML70 soaks thro' the polyurethane varnish & lifts off the paint underneath (& the proofer follows).
In short, single shot Polyurethane with ML70, 5% nitro fuel did not work for me.
Best of luck
Regards,
wurger
From 1974 until 1996 I used Castor-based, 5% nitro fuel. Most of my models were painted in silver cellulose with top colours in Humbrol enamels, sometimes other brands of enamels. All models were fuelproofed with airbrushed single shot polyurethane varnish, manufactured over here by Rustin's ( and a few times by other manufacturers). 2 coats gloss, 1 matt if required. With this arrangement I had no problems, even with neat fuel.
In 1996 I changed fuel to synthetic-based (ML70 oil) with 2 or 3% castor, 5% nitro (I started using 4-strokes as well as 2-strokes and this fuel suits both). Since starting to use this, the finish of the models deteriorated - all the colour coats bubbling up and stripping off.
I now use a fuelproofer marketed by Ripmax known as Tufcote - I understand this is a lacquer - it is 2 part. (As before 2 coats gloss, 1 matt if required). It seems impervious to the fuel I now use. the only problem is that it is thinned with cellulose thinners & sprayed onto enamels, but in approx 9 years I have experienced no problems(yet!).
I was told that the ML70 soaks thro' the polyurethane varnish & lifts off the paint underneath (& the proofer follows).
In short, single shot Polyurethane with ML70, 5% nitro fuel did not work for me.
Best of luck
Regards,
wurger
