How do I bond anything to polyurethane? In particular, I want to bond fiberglass or carbon fiber to it.
I have been using polytek 74 series polyurethane. This is good stuff. It gives my mold the surface that I want. However, it is very expensive. So, instead of just building a box and pouring a gallon of this stuff in it to mold my object. I would like to brush it on, or otherwise put a thin coating of it on my object. Then to get the rigidity in my mold. I will lay up fiberglass over the polytek.
The problem is, I have been told that cured polytek will not bond with much of anything. I know it won't bond to itself. Even uncured polytek won't stick to much of anything.
What can I apply to the polyurethane after I have brushed it on and let it cure, that will allow me to bond fiberglass to it?
Thank you.
Karl