was watching this video of Eric Arakawa and when they glue the eps they throw a black goo into the gluing. So the question is if anibody knows if it is secret sauce or just epoxy with black tint?
cheers and good waves
By the way to all intressed in gluing up blanks the video is worth watching.
I use clear gorilla glue with black pigments to glue my EPS blanks
My guess is not epoxy, too hard to shape and sand. Possibly a tinted foaming PU glue as mentioned above.
This closeup looks like PU squeezeout to me, been a few years since I have done one…
Can’t get that video to play, so no opinion. There is nothing wrong with using Epoxy resin for EPS glue-ups. Nothing wrong with using Polyester for Polyurethane foam glue-ups. Both shape and sand. The main advantage is that they are faster.
The picture above was a still frame, here is the video:
PU foaming glue black tinted.
Thank you. Yes I agree. Probably glue with black.
They don’t really focus on the lines so it’s hard to tell the details. But I agree that it’s most likely black tinted PU foaming glue.
I’ve found that with EPS and tinted PU glue you will get some color in the surrounding beads as the glue will expand and penetrates & fill gaps between the beads. It won’t be a sharp clear line as you might get with the more finer PU foam blanks.
So make that surface (that you will glue) super clean and smooth or you can use an epoxy secret sauce that does not expand but just fills. This last thing has a benefit to keep the glue line cleaner as it won’t penetrate too deep into the foam. This will keep that glue line more crisp.
Secret sauce as in epoxy with microballoon filler and pigment, tint etc.
You could also do a colored glass cloth as a sandwich, never done that, but in my mind would make that for a crisp line, but most likely annoying to shape with glass in the mix.
I watched the video, I think they are combining EPS with some other type of foam. I’m not sure if its PU foam or perhaps a PE or PP foam, similar to what they use in high end boogyboards. I think it is the last one, because they seem to hotwire the foam, I’m not sure but I thought you couldn’t hotwire PU foam.
Thank you very much, i have seen done with a carbon cloth + epoxy glued as a stringer.
cheers and good waves.
I don’t understand why people don’t use Poly or Epoxy resin. Instead of looking for so many quirky alternatives. Both work.
You can hotwire PU foam but high toxicity fumes (isocyanate content).
Foaming glue deeply penetrated between eps beads improve strengh but no clean lines.
