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Gap Too Large For Caulk?

5K views 10 replies 6 participants last post by  Half-fast eddie  
Had a similar situation. Cut a slice out of an old pool noodle and filled before the caulk as a backer (tub and casing gap, not tile). Polyethylene foam is mold resistant and will flex with the tub. I have always used silicon caulk in the bathroom, so I am interested in following everyone's opinion for and against (above).