So far I have similar results to your sheet metal tests. However, I found that I could achieve the desired effect as long as I applied a thicker coat to the primed sheet metal or other smooth surface. My limited experience with this hammered copper and gold is that an un-primed surface, whether sheet metal, cast aluminum or paper and inkmickyd wrote:Since you like to play as I do, duplicate my primed vs. unprimedwork. Unprimed steel sheet metal DEFINITELY resulted in a a more uniform, fuller texture. I didn't prime my Mark 5 steel parts because of this. Rustoleum had conflicting technical information on whether primer was needed or not so I went with no primer. Can't attest for longevity yet but almost 2 years later, it's still perfect.
I also experimented with not using self etch primer on some of my aluminum parts as discussed in this thread just to see if hammered paint bonds well by itself to aluminum. Again here, to date, looks great.
will achieve the hammered effect in a thinner coat BUT pinholes are more likely in the dimples. I also noticed a difference in how likely pinholes are apt to form depending upon temperature. I've applied this stuff at 45to 50 degrees (low end of the acceptable range) and at about 70. The colder temperature seemed to cause more dimpling and pinholes than the warmer temperature. Of course, this is not a random, double-blind statistical analysis so my observations are only anecdotal.
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