Karen, it would have better if you had asked this question BEFORE you
installed the pan. I could have saved you a few steps in this process. I
too have a Ragusa Pan on my transmission. It too seeped fluid. The casting
is porus and tranny fluid is very thin when it is warm. I removed my pan
with the intention of sealing it some way. I have a friend with a
transmission shop, and he has a handy dandy parts washer and special
solvents that gets rid of all traces of transmission fluid. After I paid
him a nominal sum to wash my pan, I coated it with 2 thick coats of GLYPTAL
INSULATING VARNISH. Then I baked it in my powder coating oven overnight at
125 degrees. The baking step speeds up the cure rate of the varnish. It
will air dry, but takes several days. I reinstalled the pan. It has been
several years and a couple of cross country trips and so far, no leaks.
Nothing is forever, but this comes close. I wouldn't try powder coating or
line-x bedliner. But, you do as you want. It is your money and time that
you are spending.
Jim Hupy