Yup... you can use that over the welds and it will work fine, or you can prime the bare welds with zinc chromate and paint them. The welds themselves are going to be your problem areas for rusting, since the deposited weld metal is not galvanized, so as long as you seal them from the air you'll be fine.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
|