[Boatanchors] Wrinkle Paint

[Donald Chester]

>  I wonder if the finish you are thinking of is what is sometimes
>  Called crackle.  This is different from wrinkle in that it looks like 
>  dried mud.  This is the finish used by General Radio and was 
>  used by Hallicrafters for the SX 28  and elsewhere. I don't remember 
>  if I've ever read a detailed description of how it was done but 
>  seem to remember that it requires two coats and baking.  
>  Perhaps related to the finer wrinkle paint in that both seem to 
>  use two components that shrink differentially.

Thanks for  the explanation of the difference between wrinkle and crackle.  I am familiar with the texture of the finish on General Radio equipment and the SX-28. No, what I was referring to is true wrinkle, The best example I can think of is found on the mid 1930s National
HRO and the National oscilloscope of the same era.  It has a coarser texture than the fine wrinkle on, for example, the 75A-4.  I try to explain it as "grainy", reminiscent of the grainy appearance (but not to the touch) you often see on brand new galvanised roofing tin. The wrinkles are raised higher than those on the 75A-4, and the texture is not as thoroughly uniform as what's on the Collins.

Don k4kyv