On Tue, 17 May 2016 11:38:26 -0700 (PDT), "
wrote:

On Tuesday, May 17, 2016 at 11:47:32 AM UTC-5, wrote:

But like any product, extensive repairs require some familiarity with the product to get maximum performance. The lack of surface prep was really obvious in the video when they peeled back the hunks of Bondo and you could see the rotted wood the covered. You could also see further deferred maintenance on all the surfaces as well. It looked like an abandoned warehouse to me, so no telling when the work was actually done on those windows, or if it was just another idiot's repair.

Robert


Since polyester filler is not waterproof the wood can rot under the
filler as well.

Note that as pointed out numerous times in this thread that lack of preparation is a great deal of the problem in the video.

What filler is completely waterproof? Solid epoxy finishes are for some time, but they break down eventually.

In context of this post, water proof fillers for wood(none of which I know actually are)the fillers are nearly irrelevant except for their ability to hold a sealer and retain elasticity.

In the specific case of this thread, it was stipulated that the door (and its fillers) would be painted, so whether or not the filler provides a superior water proofing on its own as a stand alone product is irrelevant.

You guys make this stuff waaaaay to hard.

Robert
And youn make it just a lirttle too simple. The wood expands and
contracts and the paint cracks at the joint. Now the polyester filler
is exposed to water at the joint. it soaks up water and expands,
coming loose from the wood. It dries and shrinks, leavibg a gap. it
gets wet again abd the wood gets wet - and soon you have the mess that
was under that bondo - even if there was half decent prep done.

Just like using polyester body filler on a car without sealing the
repair welds - or worse yet using it to fill rustouts. It won't last -
period. Seal it with an epoxy based fiberglass patch and it will last
almost forever. Polyester resin and fibergkass is a lot better than
that talc filled body-filler crap, but even that breaks down.(and
sometimes pretty quickly)