Thanks for the input. After looking around some on other sites, I did find multiple hits for geocel for use on rvs. Most seem happy with the results. I couldn't find much on lexel for rv use.
I also don't think there is anything that will be structurally harmed by the cracked sealant but I want to make it look better. It's a little cold now to try it but going to buy some geocel and get it done in the spring.
Happy camping!!
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