I just switched from 2018 32' Thor brand Class C to a 2011 Itasca Meridian 34Y with 340HP Cummins. What a difference. Great upgrade for me but as it is 10 years old, I have some things to fix. I have already been able to take advantage of some great information on this site. One of the first things I had to do was "re-glue" the fiberglass rear engine grille to it's steel substructure. It seems it's not an uncommon repair and there were plenty of threads and posts on the subject going back to at least 2012. I decided to use 3M 5200 fast cure adhesive. I cleaned and sanded the fiberglass contact area and sanded the paint off the steel contact area and used wood working clamps to hold it tight and keep things aligned. I remounted to the motorhome and it works perfect so far. Unlike the original adhesive, the 5200 expanded a lot after being squished through the slots in the steel frame. If the adhesive bonds well to the fiberglass I don't see how it can come loose from the steel bracket. But if it does fail, I will probably install stainless hurricane bolts with a rubber washer to protect the fiberglass.
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