3800SC sudden loss of oil pressure? (Page 2/2) theogre JUL 17, 03:20 PM Most have dry "paint" sealer pre-applied. even that can interfere getting a good ground but seals well. If remove a sender that ground to engine,,, Teflon paint sealer from any plumbing source that never dries is good. Rectoseal etc that dries is good too but if have to pull apart again for whatever reason is hard to clean the threads. Any fitting had dry hard sealer must be completely clean. I often use "dremel" w/ wire wheel on low to medium speed. High or single speed wrecks most bush tips & more. worse wire wheels @ high speeds or loaded too hard often end up as needles hitting you often in eyes & other very bad places. Many put them on bench grinders etc have same problem for same reasons. would thing that all the sealers should still let enough metal to hit metal often not the case especially low torque ends like most sender can break before metal get thru thick sealers.