Clouddancer
Well Known Member
I?m trying to fabricate a tube-like glass fiber duct between a NACA inlet and an fresh air vent. I thought the most straight forward method would be to use a positive mold of high density PU, wrap it with glass fiber and after curing, dissolve the PU with acetone.
Carving the positive PU mold
Vacuum bagging the mold with the glass lay-up
The question that rose was how to smoothen the surface of the PU foam and to fill the pores and cavities? A first attempt was done with RTV silicon. After dissolving the PU foam with acetone, this silicone layer showed to be very hard to remove from the glass surface, i.e. only with mechanical scraping, which is not possible within the curved tube. Any ideas what to use that can be removed without scraping?
That?s what the part will be used for?
Carving the positive PU mold
Vacuum bagging the mold with the glass lay-up
The question that rose was how to smoothen the surface of the PU foam and to fill the pores and cavities? A first attempt was done with RTV silicon. After dissolving the PU foam with acetone, this silicone layer showed to be very hard to remove from the glass surface, i.e. only with mechanical scraping, which is not possible within the curved tube. Any ideas what to use that can be removed without scraping?
That?s what the part will be used for?