You are going to hate this.
The only way you are going to make a sticker stick to a dimply rough
surface is to flatten it. An iron is what some of my friends use to
smooth out bumps on thier rental fleets. Use the iron to smooth out the
place uyou ant the sticker to go and then slap the thing on there.
Now " Environment people and lock keepers check your boats to make sure
you are BCU members "??? What the hell is that???
Don't tell the CRCA ( Canadian BCU ) about that.
That is an interesting and disturbing concept.