Cove adhesive

I've not done any coving in ages so no idea. Always used to be 3, 3.6 and 4.2
I put 4.6 on that earlier post but that was wrong 14ft were the longest available as far as I know.
iwas thinking that but no tape in house to check it cant be f**k*d with foreign measurements
 
Johnstone's sell 3.6m coving in the 127mm size. Longest I've put up is 4.2 from Bences building merchants but 20 years ago. If you got to join then seal. Fill join with filler before fitting. Pack the bottom or top so the join sits perfectly. I use window packers from 1mm think but pull out when set. Packaging works great when needed to get it lined up
 
only way to join two pieces is to do a scarf joint totally invisible with out filler /also when cutting coves only cut with the down stroke of saw cutting with saw on up stroke only tears paper face and looks untidy
 
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