Been swerving the sealer lark but a neighbour wants shiney block,i have cleaned his 50 sq metre drive a few weeks ago and want to know the safest product t use,i know block has to be well clean and brushed,i know it has to be totally dry for a good few days to do the job but i want a good basic product and a good basic method of application,also the cost to purchase the sealer,thanks Dan.