I’d suggest that the “flow lines in your injected waxes” would have
to be a Temperature issue. I know you stated that you’d tried higher
and lower temps…with no success.
There is more than one way to address this. My first thought would
be that the mold itself is cold/cool and that could cause the wax to
"chill" and possibly leave the “flow lines”. Or that the wax wasn’t
hot enough when injected(that’s my gut reaction), OR a combination
of the two.
I’ve found that almost every mold…and different wax have specific
temps and pressures to get optimal results. That is something that
is only determined with experimentation.
That being said…I’d suggest that you try a higher wax temp. which
will have two effects. One…should allow the wax to flow longer
without the “chill lines” and it will also “preheat” the mold. It
only takes a few “injections” to get the interior of the mold warm
enough to not be an issue. Once that variable is taken out of the
equation…then you just need to “dial in” the proper wax
temperature and pressure for injection.
THE good news is that you’ve gotten GOOD waxes out of the mold
before. So you know it’s doable. ONCE you find out the “perfect” temp
and pressure I’d suggest that you mark that on the mold. IF pre
heating of the mold is ALSO needed… make a note of that too.
I must admit, I’ve never used a “hand plunger” to inject wax… that
could be part of the problem… being able to get consistent with the
best of luck getting better waxes. Let us know what you figure out.