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B110 cone dope

 
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iso
Senior Contributor 200+


Joined: 29 Aug 2011
Posts: 215
Location: Finland

PostPosted: Sat Sep 24, 2011 2:16 pm    Post subject: B110 cone dope Reply with quote

Colins info about white belly B200 was informative.

However, it would be nice to know if 80-90% mixture of PVA glue is older grade carpenters glue (as far as I remember it is B3 grade) or newer D3 grade. Sika brand specifies 15 min working time on older grade glue and 5 min for D3. D3 also resist moisture quite much better. This can be advantage if everything works OK, but it would be much easier to remove older grade glue after unsucsesful dope.

It would help to decide how to proceed if one will know which grade of glue Kef used, when drivers were made. If you can melt and remove all old dope, repair might be easier to make... but if this is not possible making patch on damaged area is probably only option.
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Sat Sep 24, 2011 4:32 pm    Post subject: Reply with quote

Quote:
which grade of glue Kef used


KEF used Plastiflex a pH7/neutral bookbinding adhesive, hence my comments about "fishy smelling" amines in cheap PVA glue.

Elmer's and Gorilla are probably neutral, some of the rest will have pHs ~5 like Evo-stik, so get scientific with a jar of water + glue + pH papers either analytical or from the garden centre and do some measurements Shocked .
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