Seam sinkage!!! in Tools 'n' Tips Posted May 10, 2012 You can try mixing some baby powder into the cyano, prevents it getting too hard to sand. Using cyano avoids the shrinkage problems as it does not melt or soften the plastic. http://s3.zetaboards.com/locate_and_cement/topic/744332/1/#new Used this method, and with a bit more savvy on the use of Cyanoacrylate has revolutionised my modeling, thanks very much for all the help! I'm even tackling ejector pin marks in places I would not have done before1 Another satisfied customer!