>I agree entirely. Its all to do with surface free energy (or surface
>tension).
>Thus, the idea of tooth adhesion is a myth (except in former Soviet states
>were it was held to be true). What abrading does (as you rightly state) is
>to increase surface area AND to energise the surface to provide enhanced
>surface free energy. The latter effect is short lived as contaminants (eg
>atmospheric water) will quickly invade the new high energy sites.
Duncan & Fred,
This is the idea behind peel ply. It also explains, which unfortunately the
manual does not!>? why it is important not to remove the peel ply until the
next bond is about to be made.
Graham
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