I’m using a Car Battery Charger setup as my hotwire power source. It cuts nice and cleanly. Except when it comes to the PU glue joint, which is a minimal thickness. I’m using 3 layers of 2" thick EPS.
When I have to run along the joint rather than cut vertically through it, The hotwire just can’t get through it.
Any tips & tricks that would resolve this, apart from buying a block of EPS, as I have loads of sheets of 6’ X 4’ X 2" for free.
You can’t get a nice hotwire cut through the glue. It ain’t gonna happen. Just rip/cut out the chunks, proceed to hotwire to the best possible tolerance and handwork it all. You can fill the chunk holes later with the foamdust and microspheres to get a sandable surface and of course proceed to seal the entire blank with microspheres when your done shaping the blank.
CMP uses it to do his stringer glue ups on his EPS blanks no expansion problems or hand colorization issues like with PU.
He even experimented adding in colors like neon pink or neon green pigement etc to indicate the poundage of the EPS used 1lb-3lb kind of like how Midget does with his PU blanks…
Being the guy he is he even gave me a bottle to try out and play around with…
ended up buy a couple more later at over retail at woodcraft.