All sounds reasonable, but I'm sure you meant MEK; methylene chloride
(paint stripper) is one of few common chemicals which will destroy epoxy
resin!
#36-40 grit sandpaper can easier slice up the glass cloth, reducing
strength. Also, I once tested grit vs. adhesion on 1/2" test strips,
and #400 grit seemed to result in stronger bond than #50-grit abrasion,
requiring more force to debond it. I couldn't measure that exactly, but
viewed under magnification the #400 test strip resulted in greater
damage to the glass fibers of the other surface.
Regards,
Fred F.
N3EU
> His method.....
> 1) Check the temperature of the surface of the lay-up area. Get above 70'F.
> 2) Wipe down the area of the lay-up with acetone or Methylene Chloride to
> remove any grease, oils, or mold release. Then don't touch that area without
> gloves!
> 3) Use 36 or 40 grit sandpaper to really scratch up the surface for bonding.
> 4) "IMPORTANT PART!" Lightly brush the area with your resin mix.
> 5) Then apply the lay-up. Either by laying down the glass on the area and
> wetting in place or wet out the lay-up on plastic sheet and apply all at
> once.
> 6) Keep the temp up for at least four hours.
|