Well i followed the advice given. Mixing the pva glue and putty came out pretty well actually, the layer didnt break once it dried.. and no chipping... simply awesome i would say. It took me awhile just to layer the foam but it was worth it. But im still patching up some of the hole in the foam to prevent it from melting when i spay paint it. well this is what i got out of it. Cant wait to give it a spray coat of dessert brown.
I will keep this work posted from time to time.. thank for reading. Please do give your suggestion should you have any to help me improve the terrains.