Both "заливной" and "заливочный" are correct, but the more common term is "заливной пенопласт" (foam for filling) rather than "заливочный пенопласт."
Both "заливной" and "заливочный" are correct, but the more common term is "заливной пенопласт" (foam for filling) rather than "заливочный пенопласт."