Welcome,
Thats a feat in its self to go from TX to TK/TD. Sand the black abs down to rough and good plastic primer before paint will be a good idea to get the adhesion to the black abs. Might be an idea but sell the TX and buy a white kit to make into a TD. I have seen it done with good results, just very time consuming to make a change like that.
Good luck on the move to the dirty side.