Yes Steve from the bottom, and your not trying to fill the seam just mist in a decent film and it will creep into the gaps it can for a time until it finally sets up. If you remember on my thread after I removed all the seam sealer on the inside of my car and blew as much of the loose rust and debris out of my seams I brushed a wet coat of Por15 on them, enough until they dripped out the bottom, and then after that dried I applied a modern seam sealer. Now that went a long way to protect the tight seams but the larger open seams on the bottom can use this wax oil spray to help protect them.
I used a product by Pro Form but if you do a web search you’ll find quite a few options and many have an aerosol can version so you don’t need the gun.
