BEFORE you pour anything down there make sure you got all the rust out. i had to take off my fender, peel the seem apart, get all the old sealer out, sand the rust down completely, coated it w/ some por 15, and then sealed it up w/ some seam sealer. make sure you do it right or else youll be going back in there again soon.

but there is a possibility that your windshield is leaking.....

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.