Sorry if this is a repeat but had an email problem.

Had coolant leak so head gasket replaced.  Don't know if I really needed
head gasket done because ended up with leak again in exact same place.  Took
to a different person who said looks like it was overtorqued...leaking where
bolt goes into engine so he temporary fixed with sealant.  This worked well
until recently.  Guy is no longer around and now it's leaking again.  Is
there a way to fix as I don't want to buy new block or head whatever the
part is called.  Will sealant work again or is there a way to insert
something so bolt will fit better?