Polar Express Layout – Sealing the Stream-bed with Flex Paste Posted on January 31, 2020 by God Scout The next steps in repairing the watercourse is sealing the stream-bed with Flex Paste, a Woodland Scenics product. Share this:TwitterFacebookPinterestPrintLinkedInTelegramSkypeRedditTumblrPocketWhatsAppEmailLike this:Like Loading...