I have totally no idea but i dunt think that cowl is going to be seeing much rain or outdoor weather im plannin on always carryin a cowl cover jus to prevent any problems. Although the job was done right and all that i dunt want any worries so i rather just prevent. When i took mine apart i didnt have much leaves i think the leaves were jus fallin in through the hats onto the floor lol! i found more leaves and crap under the dash and on the floor than anywhere else!