M_Boats: Sealants for re-bedding deck items

Hi All - I will be re-bedding my teak handrails ect. I have been reading about various marine sealants. According to Don Casey's book, he suggests using a Polysulfide if you ever want to get the item off again. Which I may need to do someday. I know many of you use the 3M 5200 product which is a polyurethane. And according to the Don Casey book is extremely difficult to remove if you ever need to. In researching the sealants, 3M makes a 4200 that is supposed to be easier to get off if the someday comes. Has anyone used it? I hope you can let me know your experiences & recommendations. Am I over-thinking this? Thanks! Todd M-23 #86