🚀 go-pugleaf

Roger Wilfong (Roger.Wilfong@umich.edu) wrote:
>  
> Do you just use a plain old polyethelyne (sp?) bag (like a garbage bag) and 
> hook it to the vacuum side of the compressor?  
>  
> Do you need to do anything to avoid sucking the resin into the compressor?
>  
> - Roger

In plastic shops they sell polyethene (I think) in a 'tube'
form: the plastic is in a big roll, and if you cut a piece,
you find out that it has two layers with sides together (hard
to describe better...). The plastic is clear, quite soft, and
about as thick as garbage bags. It comes in many different
widths, is cheap, and (very neat:) epoxy does _not_ stick to
it. So just cut a piece large enough, put your mold or
whatever in, and let compressor suck. To avoid epoxy inside
the compressor, use a length of silicone (or rubber) tubing in
between bag and comp. You may need to cut a couple of cm:s
some times, as some epoxy indeed is sucked into tubing.

Hint #1. Do not try to seal the bag using tape or something.
Buy some silicone padding, spread that to the ends of the
plastic 'tubing' (inside), and through the clear plastic you
can see when it ise airtight. Let the tube run through one end,
though. :-)

Hint #2. If you have a vacuum bottle (I recommend it), close
the tubing (that will lead to the bag) with clothes peg or
similar, and let the pump suck vacuum to the bottle while you
work with the mold. Close the bag with silicone. Now by
opening the clothes peg a little at the time, you can control
the fibres in the mold (or whatever), as you _gradually_
increase the vacuum and the pressure.

Hope this helps...

-Tapio Linkosalo-