Raf Posted July 3, 2018 Report Share Posted July 3, 2018 What sealant should I use to install a new live well pump? It is below the waterline and I'm reading marine grade silicone is a no-go? 3M 5200 sounds too permament, so 4200? Will that come off if I need it to? Link to comment Share on other sites More sharing options...
porkpie Posted July 3, 2018 Report Share Posted July 3, 2018 4200 is supposed to come off. I have used it in the past and it has remained watertight. If your just replacing the pump, in the original inlet and not cutting any new holes, 4200 should do the trick and keep you dry! Link to comment Share on other sites More sharing options...
Raf Posted July 3, 2018 Author Report Share Posted July 3, 2018 (edited) Thank you. I got some 4200. Yes, just replacing the existing pump. Now for the heatwave to break. Edited July 3, 2018 by Raf Link to comment Share on other sites More sharing options...
misfish Posted July 3, 2018 Report Share Posted July 3, 2018 587 Blue High Performance RTV Silicone Gasket Maker. Link to comment Share on other sites More sharing options...
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