I have been waiting for the weather to clear up so I could spray the top coat on the main hull.
Finally after a week it all came together and it now has the top coat.

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An interesting bit of trivia- To spray two pack polyurethane one should have a relative humidity of less than 85% and at least 3 deg C between the Ambient Temp of the surface one is spraying and the Dew Point Temp. This is because when the paint hits the surface the evaporation of the thinners cools the surface by around 3 deg C. If the surface temp goes below the Dew Point Temp moisture will settle on the surface and this moisture will affect the hardener in the paint. The drop in surface temp is the same as if you get acetone on your hands. It makes your hand cold because its evaporation is fueled by energy it takes from your hand thus making it colder. The same thing happens when you spray paint. I had to wait a week for a wet spell to pass and finally ended up with a relative humidity of 58% and Ambient Temp 8deg C above the Dew Point.


Attached Files
topcoat s1.jpg (736 downloads)
topcoat s3.jpg (730 downloads)
top coat s5.jpg (740 downloads)
Last edited by phill; 01/08/16 10:39 AM.

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!