Filling small gaps in floating floor

I have installed a floating floor in our dining room. Whilst taking great care there are a few small gaps (0.25 - 0.5mm) between some of the end joins of the boards. The manufacturer says to use a non silicone based filler to fill any gaps. Does anyone have any ideas what a suitable product is? The timber is Jarrah. I'm not interested in a colour match, just want to fill the gaps with something (clear will be fine), as a few stand out when the right light hits them.

Thanks


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