Read the whole article with the stills that this video mentions over on FliteTest
https://www.flitetest.com/articles/polyurethane-treatment-of-dollar-store-foam-core
Here I test the application of oilbased (NOT WATERBASED) Minwax polyurethane brush/wipe on coating on dollar store (ADAMS) foam core. This is done specifically for preparing foam core RC models for paint. Half of the test piece is treated while the other half is left untreated. Both sides are then painted with premium and cheap spraypaint, brush on acrylic (as a demonstration of what not to do) and misted heavily with water.
This is a followup to the technique shown on Flite Test
https://www.flitetest.com/articles/polyurethane-treatment-of-dollar-store-foam-core
Follow up video of this treatment on a completed FT Nutball airframe:
Post time: Jun-26-2017