Bathtub caulking

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Joined: 01/10/2008 - 17:41
Bathtub caulking
I am in the process of "re-caulking" my bathtub.  I have the old caulk out, but my problem is that on the outside edge of the tub there is such a huge gap that if I fill that with caulk it will never there something I can fill that space with so I don't put a whole tube of caulk in that area?  The only thing I can find online is to use backer rod....................any suggestions?