Date: Tue, 22 May 2007 23:16:12 -0700
Reply-To: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Subject: Re: best t molding adhesive?
In-Reply-To: <vanagon%2007052216465338@GERRY.VANAGON.COM>
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When using this material in a cabinet shop I found it best to cut it
somewhat long and push it back into itself when installing.
Otherwise the stretch factor when you smoosh it ( sorry to use the tech
jargon) into the saw kerf will result in unsightly gaps when it contracts
to its original relaxed state.
On 5/22/07, Bill Glenn <idahobill@gmail.com> wrote:
>
> On Tue, 22 May 2007 00:53:57 -0600, justin - <jtrashy@HOTMAIL.COM> wrote:
>
> >any ideas on keeping the new t molding snug?
> >
> >how do i keep them from shrinking?
> >
> >thanks
> >justin
> >_________________________________________________________________
> >Change is good. See what's different about Windows Live Hotmail.
> >www.windowslive-hotmail.com/learnmore/default.html?locale=en-
> us&ocid=TXT_TAGLM_HMWL_reten_changegood_0507
> The vinyl used for the extruded T-molding possesses a higher coefficient
> of
> expansion than the plywood to which it was attached. The two materials
> move at differing rates in response to temperature changes. Molding cut
> to
> fit at 70 degrees will increase considerably in length when the interior
> of
> the van is much hotter, and the molding will shorten considerably when the
> interior of the van is colder; the plywood, having a lower coefficient of
> expansion, is more stable over the same temperature range. The vinyl
> molding, while quick and easy, and thus efficient from a manufacturing
> standpoint, is essentially not suitable for an environment subject to such
> a wide temperature range, without some provision for accommodating
> expansion.
>
> Further, due to the aging of the vinyl and the consequent loss of
> resiliency, the molding can take a set, locking in the wrinkles that may
> have formed, and over time, it seems that the molding always comes up
> short
> as well. Look around your Westy, and see if that's not true. Probably the
> only time the molding ever looked good was when it was new, and viewed
> when
> at the same temperature as when it was cut to size at the factory.
>
> The replacement molding will suffer from the same limitations, and no
> amount of glue will overcome the basic physics in play, at least not long-
> term. Also, on the replacement molding that I have used, I have found that
> the leg of the T, the part that inserts into the kerf, is slightly
> narrower
> in section than the original molding, and does not grip the kerf as well,
> thus the molding sometimes works it way loose. I have had some success
> with folding a piece of duct tape or electrical tape over this leg as a
> shim to make it fit tighter, but it's not really a solution. I re-adjust
> some of the more-visible pieces from time to time, and otherwise just live
> with it.
>
> How's that for a long answer to your question, without providing a
> solution?
> Anyone else?
>
--
Jake
1984 Vanagon GL
1986 Westy Weekender "Dixie"
www.crescentbeachguitar.com
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