Just under the railway bridge between Rhodes and Meadowbank (Sydney, Australia) there is an area with odd shapes of concrete at strange angles and sort of linked together with sections of GRP.
There are also benches which overlook the water.

I don’t often go there, but a few weeks ago I was in the area and thought that I would sit on one of the benches, look at the river and mull over some issues.

I noticed that there was a hole in the FRP . I have never seen anything like this before and thought it very strange.

Although I’ve used the product on several occasions with great success, I’m not an expert.
I generally regard this product as bullet proof.

Maybe this is a common occurrence – but would be very interested, purely for my own knowledge, to know what has caused the FRP to degrade like this.