(a) Any person, including any individual, partnership, association, or corporation, having a claim against a policy or an insured under a policy issued by an insolvent insurer, which claim is a covered claim and is also a claim within the coverage of any policy issued by a solvent insurer, shall be required to exhaust first his rights under such policy issued by the solvent insurer. The policy of the solvent insurer shall be treated as primary coverage and the policy of the insolvent insurer shall be treated as secondary coverage and his rights to recover such claim under this chapter shall be reduced by any amounts received from the solvent insurers.

(b) Any amount paid a claimant in excess of the amount authorized by this chapter may be recovered by an action brought by or on behalf of the pool.