About half way, i had a block of it, i halfed it and then trimmed to fit, painted and then put it under a cooling grill
to dry the paint, suffice to say the grill hadnt cooled as much as i thought and it shrank it by about 10% ha ha ha ha :lol:
I would try to add more, leave the temp sensor in not too small cavity but surrounded by the stuff.
The sensor is cut into the styrene, a tiny channel, some more came today, when i get chance i will build it up
some, there is only about 1-2" gap as it is, will update once i have modified and tested again 