First, I'd suspect you're using the term "laminate" to describe the laminated sidewall (FILON/luan/foam/luan/vinyl wall covering) not "laminate as in plastic coated paper flooring" or "laminate as in formica covering MDF countertops"...
What you actually have, I think, from your description, is a "wet luan backing" on a FILON sheet that probably occurred from water intrusion that rotted the luan.
I'd first ask, how big is the damaged area? If it's 12" square or if it's 2" square will make a significant difference in how you approach a repair.
After determining the size of the damaged area, next is the extent of the damage. Is it "just the luan backing"? or does the damage extend into the fiberglass (FILON) substrate?
The first (at least for me) step is to stop any further leakage into the area. After sealing the roof, the next step would be drying out the affected area. That all needs to be completed before even attempting any repair. Then, depending on the extent of damage, the size of the damaged area and the condition of the components, you'll need to proceed based on what's actually there.
It's impossible to advise "cutting away the damaged area" and it's equally impossible to suggest "drilling small holes and injecting 2 part epoxy under the FILON surface" if it's a 6 square foot surface that needs repair... While both of those would be viable, recommended repairs if the area were 1 square inch in size....
So, what are you dealing with? photos and a detailed description would bring much better focus on repair options.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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