Best underseal?
 

Looking to clean out and underseal the rear arches on my blob wagon,maybe even do the whole underneath in the future so what's the best underseal to use? I know there's the standard hammerits stuff but what else is recomended? Also would it be best to brush on the rear arches or spray?

Just wanted to check whether you're including waxoyl in the hammerite category ?

Waxoyl not more a cavity filler? I'm just looking for good stone chip style stuff. Dinitrol 447 any good?

Waxoyl is what Scoobyclinic are using to underseal the whole of my Hawkeye with.