My motorhome is 1978 so there like 3 differant colors of sealant around out side edges on the roof .. So I was going to remove this old nasty stuff ..and put on a fresh coat of self sealing culk RV sealant .. I can see the reason these seems crack open is do to flex in the rig and the use of culk that gets dry and cracks (cheap junk) anyway has anyone found a easy way to get this old culk off ?? heating gun ?? what works best ?? also after I get the fresh culk on I'm going paint the whole roof with RV roof sealing latex Black jack white for mobilehomes(got at menards) This motorhome been stored in shed and never had any water damage yet but its time to do a bit of updating before it does ..thanks for any info ..