Have you tried the CASTaCOAT method.....this is John Murphy's attempt...it was his first as well !
What he says is use VERY little (as per 2nd pic) to get the even but thin result
[img.nr] http://smallshopeu.com/M1A1%20J%20Murphy/IMG_0932.jpg[/img.nr]
[img.nr] http://smallshopeu.com/M1A1%20J%20Murphy/IMG_0888.jpg[/img.nr]
Images from here
http://smallshopeu.com/M1A3%20John%20Murphy.htm
AJ