Ridiculous!
I was wrong and my size was actually 49 not 47, woops.
Anyway, made 13, then 15, then 18. Bastard STILL wouldn't seal!
So I 'cut' the dome in half with moon dirt and it sealed. Took away 1 sealer at a time to see how many I need for each half.
14 SEALERS per HALF!! I need 28...