One of my neighbors bought another brand that had some bad spots, probably delam as well. He had the whole front covered with diamond plate. Looks intense now but he said as long as he maintains the seal around the edges he should be good to go.
The good thing is if its only small spots it probably won't grow, the damage is already done. Another RV owner I talked to while camping had some small spots and he sanded them down and then ended up putting a vinyl sheet over it, like for vinyl lettering. Almost looked like it belonged on the RV from the factory.
Two Wire Fox Terriers; Sarge & Sully
2007 Winnebago Sightseer 35J
2020 Jeep Gladiator Rubicon