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Silicone works as well as bondo and isn't as messy. Silicone comes off like a banana peel if you ever want to remove it, well.... it has a little more resistance than that.
I'm just suggesting you consider it. Depending on how much mesh you want to put on it may or may not work. But for small or medium amounts of mesh colored matched RTV silicone it really easy.
Welcome to HAN btw.
If you're talking about mesh for grilles...try tyraps. When you want to take it off...snip snip. Cheap, easy, no mess, grill won't fall off, and if you do it right looks just fine. Maybe use white ones on a silver grill, and black on black. I have black ones, and you have to really look hard to see them.