Do I need to get the undercoat treated?

[GMC4Zee]

Just as the topic says. Has GM increased the the frame coating or do they still rust after 1 winter in the salt belt. My 2016 looked bad after 4 years even after I painted a number of areas. Don't want a rusted frame on my 1 year old truck.

[shakenfake]

Get it treated

[20L8TSierra24]

What ^^^ said. It's the same.

Edited September 26, 2021 by 20Denali21

[GMC4Zee]

I heard from a source that we should not use the oil based products as they soften the wax factory undercoating and then it just washes off. he suggested just getting a factory can of coating and touching up in the spring. 

[dquest]

I treat mine with Krown every year.  Its the only thing I will use.