Traditionally about this time of the year I take down the skylights and
re-install the pipes for the woodstoves for the wintertime and before I leave the
roofing I check to see if any rust or patches for tar-cement or tar-paint is
needed to the steel roof. Of all the roofing materials I seem to prefer steel
roofs since they are strong and long lasting and pretty to look at.
Now I ran into something while tarring spots of the steel roof. I notice if rust
appears and I put tar on that rust spot and return to that spot years later and
peel away the tar that the steel metal is as if there had never been any rust at
all. Perhaps I made a mistake in thinking that I had the same spot. So I need to
confirm this claim before I put the claim to good use.
Unsubstantiated Claim: if you have galvanized sheet metal with some rust spots
and if you coat that rusty spot with tar-cement or tar-coating and years later
peel away the tar, you will find underneath shiny steel metal with no signs of
I put three question marks because I am not sure of that observation.
But if true then tar would be a means of reviving old steel rusted items.
And if the claim is true, I cannot think of the physics or chemistry as to why
tar can remove all rust and leave shiny bare steel metal?
P.S. And today I did some tar patching and for the first time in my life was able
to not get any on my fingers or hands or clothing or anything except the roof
job. I attribute that to carefullness but also to the application of vaseline to
my hands in case I did get some on that it would not stick. Also I bought a cheap
50 cent paint brush that I was going to throw away after the job. So that if one
anticipates the job so as to not get any tar on them, then success is attainable.
Archimedes Plutonium, a firstname.lastname@example.org
whole entire Universe is just one big atom where dots
of the electron-dot-cloud are galaxies
18 years ago