Is there anything to put on a boat, or anything to do to a boat, other than washing it every time it's used that will keep the scum line from getting onto the paint?

I just washed my boat for the 2nd time today. Probably been in the water 30 times since April. That line was tough to get off today. It did come completely off, but I'm not going through this again and I worked too hard on the restoration to let it look like crap.

I know wiping the boat down after pulling it out of the water will help.

I'm also going to hand wax it tomorrow. I'll be using 3M paste wax on it tomorrow to see if that helps. It's not their Marine paste wax. It's their show car Perfect-It. It's the best wax I've ever seen used. If that doesn't work and y'all don't have some sure fired remedy, I'll try their Marine wax.

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14