need help...what is causing this?
this is glace icing, but i know RI can do this too...what is causing my black piped design to sink in as it dries? it is not air bubbles....surface tension issues maybe? it only happens when i flood small areas...never happens on the big ones. how can i stop this from happening? desperate for a way to get around this sink-hole effect, lol, any suggestions would me so very, very welcome!