Posted by:
roger wilson
(---.hsd1.mn.comcast.net)
Marco,
Since you do need a glue that has gap filling capability, use standard epoxy and then add micro spheres to the glue to give it a gap filling property.
Micro spheres have next to 0 weight, mix well with the epoxy finish and still give a very good bond and strength for your build.
MICROSPHERES are microscopic, hollow, gas-filled spheres in a fine powder form of low density and weight. They extend the resin and increase the viscosity, forming what is called a "syntactic foam" in higher volumes, ideal for fairing/filler compounds, putties, for making low-density fillets, and for use as a laminating adhesive where gap filling qualities are desirable. The main advantage of Microspheres is that it makes the cured resin mixture easier to sand; the more Microspheres added, the easier sanding becomes. However, if too much Microspheres is added, the mix becomes unworkable. For laminating work, the activated resin/Microspheres mixture is usually still quite fluid. Order on the basis of 1 lb. per gallon of resin for a creamy consistency, or 2 lbs. per gallon for a more paste-like consistency.
[
www.fiberglasssupply.com]
The first product on the link:
"hollow glass microspheres" is the product of which I speak, and works very very well for making any epoxy a wonderful filler if needed for special needs.
As the note above indicates, don't add too many microspheres or you will have glue that is unworkable.
Good luck
Roger
