(completely liquid) while tinning with the brush, if chunky you need more heat as it must be above 730 degrees approximately to penetrate the aluminum and the aluminum will not melt until 1218 degrees. Always practice on a scrap piece of aluminum first to get used to your torch heat and ...
You see, the hardtop frame was comprised of a half cut-up Mako tower (anodized aluminum) and scrap 6061 aluminum, all TIG welded together. With little to no prep, aside from a light sanding and a wash with alcohol, I was able to brush on (stippling) two coats of Aluthane in a day...