There have been discussions here in the past about the black mystery substance used to
smooth the castings on old machinery. I have always wondered what the stuff is, but was
unable to find any definite info. Most old painting texts simply state "apply iron filler", and
leave it at that. While browsing Google Books this evening, I happened across the following:
http://books.google.com/books?id=1z9DAAAAIAAJ&pg=PA235&dq=iron+filler&lr=&as_brr=1
http://books.google.com/books?id=_xxLAAAAMAAJ&pg=PA147&dq=iron+filler&lr=&as_brr=1
Apparently, there were a great many different formulations of this stuff. The 'Keystone filler'
mentioned is a ground mineral substance, and is said to be commonly used in machinery fillers:
http://books.google.com/books?id=XdU5AAAAMAAJ&pg=PA266&vq=keystone
For what its worth...
smooth the castings on old machinery. I have always wondered what the stuff is, but was
unable to find any definite info. Most old painting texts simply state "apply iron filler", and
leave it at that. While browsing Google Books this evening, I happened across the following:
http://books.google.com/books?id=1z9DAAAAIAAJ&pg=PA235&dq=iron+filler&lr=&as_brr=1
http://books.google.com/books?id=_xxLAAAAMAAJ&pg=PA147&dq=iron+filler&lr=&as_brr=1
Apparently, there were a great many different formulations of this stuff. The 'Keystone filler'
mentioned is a ground mineral substance, and is said to be commonly used in machinery fillers:
http://books.google.com/books?id=XdU5AAAAMAAJ&pg=PA266&vq=keystone
For what its worth...