Tax on imported goods to be paid by a trader

Hi,

We are a trading company in bangalore. We import material and all the BCD,CVD and additional duties are paid by us at the time of importing the goods. We are not availing any of the credit.  The imported goods are sold to various customer in India by raising VAT Tax invoice. All the VAT / CST taxes are paid to respective state authorities via Monthly Tax returns - VAT Form 100.

Kindly advise whether we can file application for claiming refund of additional duty. Is there any restriction on products eligible for refund?