I used Toyota’s relabel of ThreeBond 1282B at $70/tube. I could have gotten away with Toyota 103 FIPG(relabeled ThreeBond 1207B) or Permatex Optimum Grey/Right Stuff Grey 90 minute. But, the current Toyota pink coolant is pretty aggressive on RTV - even though I used Prestone Cor-Guard for coolant I wasn’t going to take chances. I have a feeling the sebacate organic acid component Toyota specifies in their coolant is much more aggressive on certain elastomers than the deconate/hexanoic acid components of Dex-Cool and AMAM coolants like Prestone.Yes, you'll be so happy that thing should last forever now, and when they have to reseal mine, 2004 Sienna, they'll find the broke off e-Torx head of a stud, there was all the thread left so I just put the nut on and figured it'll get replaced if I ever have to reseal that again...I went with the Permatex Ultra Grey for sealant,.
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