Bahh . !
The . 077 Sheet is really 2 m m , out here its all metricated now . Besides being apalling growin & milling .
ANYWAY ,
Ive been using a piece of plastic downpipe , NON SHRINK Dop , Two Coats .
FIRST , Block Sand shhet outer face on bench . Then Dope . Then Block Sand Again . Then . . . Roll Onto 3 3/4 in ?? plastic tube .
A pile of rubber bands & a stick down each edge . Or Cardboard over it . LIKE MOULDING you get bleedy great whelts , from the rubber bands
IF YOUR NOT CAREFULL .
The Theory behind this , IS the curve is tighter than the rib curve , fitted . So it bulges OUT at between the ribs .
Actually - seems to stay pretty flat , unsunk , unsagged .
HOW MUCH of this is due to NOT having to do more than token sanding ( With a FOAM BLOCK - cut from a chilly bin - greengrocer type )
after fitting , which gets the thiness all out of whack , is anyboys guess . ( Not Really ) Can even get a 12 in stick with 220 - 320 paper ,
and it stays in contact along its length .
Used this on about for now . The one that wasnt didnt and was a paIN .
From ' off the stack ' you can put it on the tube , overnight . Or after a few days , sand it ON THE TUBE ( for support - curved )
so its pretty much ' flatted off ' to the curve - BEFORE fitting to the ribs . There ya Go .