I heard, that the cracks which appear in plastic fillers are because the
filler expands and contracts at a different rate then the metal underneath.
It's because of this expansion and contraction that cracks appear in time.
Roger Helman
Egil Kvaleberg wrote:
> On 8 May 1998, Dr T. Dafforn wrote:
>
> > I've seen, during the restoration how water seems to get under filler
> > somehow and rots the metal from the inside...
>
> Correct.
>
> Applying filler to bare metal will make it stick, but small cracks in the
> paint on top may easliy cause havoc - filler is in fact quite a
> hygroscopic material.
>
> > I don't want this to happen..
> > So I was wondering wether its is worth painting zinc rich primer over the
> > area before the filler was added, to protect the metal..
> > Will this prevent the filler from sticking???
>
> To a certain extent, yes. It will not stick as good as to bare metal.
>
> > or am i just being too paranoid about rot?
>
> No - that is simply not possible.
>
> Using filler is something of a loose-loose situation. It really only works
> for in very thin layers on panels that aren't suspect to rust anyway.
> There are fillers with am imherent high content of zinc, they may perhaps
> help a bit.
>
> The best way of handling this is old fashioned lead. Not as difficult as
> it might look, either.
>
> Egil
> --
> Email: egil@kvaleberg.no Voice: +47 22523641, 92022780 Fax: +47 22525899
> Snail: Egil Kvaleberg, Husebybakken 14A, 0379 Oslo, Norway
> URL: http://www.kvaleberg.com/ PGP: finger:egil@kvaleberg.com
--
Roger Helman 71 TR6 CC67866L
Digimation Inc. http://deepthought.digimation.com/rogerh/
New Orleans La.
www.digimation.com
Voice. 504.468.7898
Fax. 504.468.5494
|