I've been doing a hobby project, creating a parabolic solar reflector to heat up a pipe of flowing water. I did this by cutting a stack of parabolas with a CNC router and secured a thin piece of plywood along the curve (imagine an extruded parabola) I then bonded a space blanket (emergency blanket) with PVA to the plywood.
Initial tests worked very well, it was actually burning the plastic pipe I originally used so have since changed to copper.
The issue is that the space blanket seems to have deteriorated (the reflective foil has gone clear) at points where the glue has not set properly (places where there is a build up of PVA and has stayed wet)
My suspicion is that the wet PVA is somehow eating into the foil lining, so I need a new type of glue suitable for this application. Has anyone any idea of something that is low cost and won't cause problems?
Thanks in advance!
Extra info from wiki on space blankets: "The material consists of a thin sheet of plastic (often PET film) that is coated with a metallic reflecting agent, making it metallized polyethylene terephthalate (MPET)"