Acrylic has a density of 1.15 to 1.2 grams per cubic centimeter. This is more dense than water thus it will tend to sink. It can absorb a little water (2%)
Polypropylene has a density of .86 grams per cubic centimeter. This is LESS dense than water thus it will tend to float. We all also know that Polypropylene ski rope floats even when worn and dirty. It does not absorb water.
Surface tension will counteract the density problem of acrylic especially on small flies. Once fish slime or scum from the water or whatever dirties the acrylic it will tend sink but since the density is close to water it will sink slowly. Having a fly floating just below the surface can be a good thing.
Applying floatant to the fly will counteract the density problem.
If you already got the acrylic use the acrylic.
Last edited by Scruffy Fly; 08-15-2010 at 07:09 PM.
dB
Sanitize your FF equipment and wash your boat, trailer, livewells & sumps. Wash your wading dog
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