Jim - If you are after an easy way to add a little bit to extend the
drywall, get some mesh tape and setting type drywall compound. It sets
chemically in the time specified on the package. I'd probably recommend
mixing up the 45 minute compound. It comes as powder at the home
centers along side the drywall mud. It is stronger, harder, and doesn't
shrink compared to regular premixed joint compound. The mesh tape will
span the seam and help prevent cracking.
If the mix you are using starts to set, toss it or push it in the deep
areas as a backing. If you add water after it starts to set, it won't
work well.
Brian
On 6/21/2011 6:49 PM, Jim Franklin wrote:
> I boxed in some basement windows in a very not-square house, and there are
> some gaps between the boxes and the casing molding that rests on the sheetrock
> walls, some as large as 1/2". The homeowner would prefer the gaps filled in
> and smoothed out rather than me laying a piece of molding over it. Since the
> gaps have no bottom, I thought I'd create a bottom with some minimally
> expanding foam and then fill the remainder with Bondo. I'm sure caulk would
> require many layers to stop shrinking, drywall mud would crack and wood
> filler...no idea but it has never worked well for me in smaller
> applications...
>
> I'm open to the more experienced options before I revisit this brain cell
> massacre of my teenage years.
>
> thanks,
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