Ah...it was you then Muddy. Did you use the same Rit Dye More for Synthetics of regular Rit Dye? Might you know where that Thread is?
Here is Muddys experience using regular RiT Dye on a Thomas body a few years ago. https://blueplastictracks.com/showthread.php?tid=2437
Here is Muddys experience using regular RiT Dye on a Thomas body a few years ago. https://blueplastictracks.com/showthread.php?tid=2437