Etched plastic searches for dark matter

Large panels of etched plastic, situated aboard the Skylab Space Station and inside Ohya quarry near Tokyo, have been used to set limits on fluxes cosmogenic particles. These plastic particle track detectors also provide best sensitivity for some heavy dark matter that interacts strongly with nuclei. We revisit prior bounds from Skylab, incorporate geometry-dependent thresholds, a halo velocity distribution, complete accounting observed through-going fluxes. considerations reduce bound's mass range by few orders magnitude. However, new analysis data covers portion bound, excludes masses up Planck mass. Prospects future searches are discussed.