I used this to make a leak proof seal when I added a drain plug (<a data-hook="product-link-linked" class="a-link-normal" href="/Dorman-65241-AutoGrade-Oil-Drain-Plug/dp/B000COBBSY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Dorman 65241 AutoGrade Oil Drain Plug</a>) to my transmission pan. I had read many stories of these drain plugs leaking after install, and saw a cure for this was to use Anaerobic Gasket maker.