Damn, i have to kiss mr. head good bye, becose im stupid .
When i started i didnt realized that the polystyren head i sculpted on should be fixed aganist moving. The heaviest part on the sculpt was the tail part and it leaned backwards wich caused a lot of crakings so i have to strat all over again.
God im so angry , i already ordered a new proper head and im going to give it few layers of fiberglass to make it strong and then mount it to some massive piece of board. Grrrrr !