Does any one have a Plexus gun I can use for a few weeks, I believe Forte gave
two to the class. I'm going to be taking my mast down to put a clear coat on
and then re-do the whole track. We skimped a little too much in FL...
Keith Councell
Der Springer
BDally6107@xxxxxxx wrote:
The following is an email from Forte (Tony) regarding spar issues. Let's
talk about this together before sending any direct responses to Forte.
Bram
From: Mtdilemma@xxxxxxx
Date: Tue, 9 May 2006 08:27:59 EDT
Subject: Re: Barbecue bill
To: BDally6107@xxxxxxx
Bram:
How much?
Glad everyone had a good time at the BBQ.
Just to answer your questions on spar management here it is.
First issue:
Some of the earley spars had there tracks attached with 3M 5200 this was
standard protocall here for our first 9 mon in business, and if was in fact the
SS class that helped us make the switch to Plexus MA 425 (remember Forte as a
spar building company has been developing in parallell with the SS class).
Those tracks did not hold on the we (Forte) procured 2 plexus kits for the SS
class. I know its a hassle to repair the track and we will do it for zip if
the spar finds its way back here. On the other hand it is the class itself
that should be administerig the shipment of the kit around to the various
members that have decide to attach there own track (each user gets to pay
shipping once). Which leads us the the next issue.
UV exposure: All SS masts are build using a Ciba/Vantico/Huntsman Aryldite
6010 epoxy resin modified with 2 surfacte tension modifiers and 2 UV
inhibitors. This whole shebang is cured with Methyltetrahydrothalic ahydride
catalized with a proprietary catalyst. This formula does not cure at room temp
ever, if it did we would be shut down. The resin back bone is still an
aromatic repeating structure and even though we add UV stabelizers this will
not allow for long term direct exposure. All spars expected to live out side
on a foat should have an additional coat of a good UV filtering clear applied.
The measures we take here will only hold on if a spar is exposed while sailing
and during rigatta weekends.
Here is what we recommend for a forever finish: If you know your spar is
to live outside the spar should be taken from us with no track installed,
sanded so the outside is flatted out and given 2-3 coats of Interlux Perfection
Clear (we buy the stuff from jamestown dist INTYVA853KITQ). The track area
should be taped off witha stripe of 3/4" blue tape so when the tape is pulled
the sanded surface is available for the Plexus/track treatment. If you already
own a spar and it is chalking after longterm direct exposure than all it needs
is a scotch-brighting, tape off the track and 3 coats of Perfection.
You may be thinking geez for $750 smackers why doesnt this include the
paint job? If we could we would. Our painter expected to spend 6 hours from
start to finish, if we had to add this on this would represent another $390.
Judging from the amount of clear being aplied to the boat it self I would first
recommned a DIY.
Smell: As all SS builders know boat construction with epoxy is not a
stinky event and the use of a 2K brushable finish is stinky. Not dangerous
(but dont smoke while applying) as the urethane is not atomized (as when
spraying) but he solvent smell is not something you want in you house. A good
day bright and not too windy can result in a realy fine job.
Bram has some additional experience with the West 207 he will share with
the class. One may consider actually building a composite spar with 207 but
unfortunately the TG is so low the spar would fall down on a sunny day and it
would plug up our resin recirculation system which remains resin/hardener
charged 24-7. If any class members have any questions please do not hesitate
to call of E-mail me.
Thanks Tony Delima
Forte RTS
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