On Wed, 18 May 2011 12:38:40 -0700, Edward Hennessey wrote:
Yep, epoxy would be much better for restoration and structural
Rather than structural my uses are more mundane, skinning
CDX plywood for waterproofing and smoothing for cheap outdoor
plaques and signs.
That's where this grade of stuff fails: the price doesn't
underwrite what you can charge--performance isn't
cost effective. Also, with the mandatory delays for curing and
reapplication, you there better have something else immediately
productive to do while you wait.
What I'm thinking they call Bondo "reapair compound" (probably
off a bit on that exactly) at HD is good stuff. It takes a quality
primer better than the epoxy putty which accepts paint best
after an outside priming with liquid epoxy.
But if you have a sizzling day, I'd think about undercoating
any Bondo you use with laminating polyester catalyzed with
MEKP. It markedly improves the grab of the Bondo putty
and kicks off like bacon on the sun when the mercury peaks.
As long as you keep the resin cool, it lasts a long time. and the
amount needed to seal an spot patch makes it go a long way.Can't
say I fancy the smell of MEKP though. Won't say it's anything
SFWIW, Bondo (polyester resin thickened with talc) has no adhesive
properties, but depends on the mechanical bonding between the wood and
OTOH, epoxy IS an adhesive.
In the BTDT category, totally lost track how many sheets of CDX I
sealed with epoxy in the process of building a boat, but bought 2
units which is 140 sheets.
Based on the above, will suggest the following.
Sand the CDX with a ROS and 40 grit discs (Klingspor has them).
Using a throw away 2" chip brush, coat all CDX surfaces with
I usually apply 2 coats, lightly sanding between coats.
You have just built the proverbial brick out house, but you still have
Epoxy requires UV protection so if used outside, with need to top coat
with a UV varnish or paint.
BTW, to fill voids, add micro-balloons to laminating epoxy to make
your own putty as needed.
Last time I checked, a 30# bag (4 cubic ft) of dicaperl (HP500) was
less than $30.00 and will last a long time.
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