So on EPS just use pigmented or unpigmented epoxy then? Probably a dumb question but I might as well ask since we are on the topic.
Also would you seal the inside edges of the two halves with spackle before epoxy and joining together?
I’m no pro builder, but for my 3 lb EPS I don’t feel spackle is necessary. Plenty much dense and less resin penetration/absorption.
Another semi-related question. For another project, I want to bond the hotwire cut surfaces of 2 pieces of 3-lb EPS foam together. Would you folks rough up the cut foam surfaces a little with sandpaper to improve epoxy adhesion?
Red, blue or black pigmented lam resin. A true glue line. Done right: stronger than big cell center foam and provides the necessary referance point. Because there is no wood, PVC or other stringer materlal it can still be condidered stringerless, but is stronger at center than a true “stringerless” blank. (ie no stringer, no glue, no nada).
Missed this one. Thanks.
If bonding two (2) hotwire cut EPS foam (3-lb) surfaces, do you prep the surface with coarse sand paper?