The 2 windows I replaced about 7 years ago with Sikka Flex and their primer
have developed a lot of cracks along the top edge. These cracks are
leaking. I cannot recall if I used polycarbonate or cast acrylic. Of the 2
choices which would be the better for replacement? They are relatively
long w
Acrylic (Plexiglass) cracks easily, but is harder and more scratch resistant
than polycarbonate (Lexan). Stock car racers use polycarbonate for windshields
in their short track race cars. It is the more crack and impact resistant of
the two plastics, but more likely to cloud if you are too aggr
Plexiglass is very prone to developing cracks from any minor
imperfections or irregularities in the edges. If you carefully polish
and buff the edges completely smooth, cracks don't have a way to start
themselves.
Bill Bina
On 3/4/2016 11:15 AM, sthoma20--- via CnC-List wrote:
Acrylic (Plexi
I was advised, by a professional, to use a propane torch to finish the edges.
It makes sense but I would have to practice a bit on scrap before I tried it on
the real windows.
Al
S.V. Elendil
37/40+
> On Mar 4, 2016, at 8:35 AM, Bill Bina - gmail via CnC-List
> wrote:
>
> Plexiglass is very
I have used a propane torch , but these days I’d go with a heat gun …
Tim
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Alan Liles
via CnC-List
Sent: Friday, March 04, 2016 11:55 AM
To: cnc-list@cnc-list.com
Cc: Alan Liles
Subject: Re: Stus-List Windows ad nauseum
I was
Professionals sometimes do things because they are faster and more
efficient, not because they are better. They also get a lot more
practice! I have finished edges with a torch, and found it leaves you
with uneven thickness along the edge, which may affect sealing on
something such as a window.
Interesting discussion. My acrylic place has advised against doing ANY edge
finishing of properly-cut cast acrylic, as that will increase the possibility
of edge crazing or cracking.
Fred Street -- Minneapolis
S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^(
> On Mar 4,
A propane torch works, relievs many machining defects that act a
stress risers and thus minimizes crack propagation, usually the cracks
don't leak, just look cracked
Dwight Veinot
C&C 35 MKII, Alianna
Head of St. Margaret's Bay, NS
d.ve...@bellaliant.net
On Fri, Mar 4, 2016 at 12:55 PM, Alan Lil
