Water in trunk (boot for us outside the USA!)

If I lift up the floor at the bottom of the trunk / boot to access the bit where the tool kit / tire foam etc is stored its always damp or wet. Anything I leave in the trunk gets damp / mouldy after a while.

The seal around the edge of the top of the trunk looks OK so not really sure how water is getting in. Anyone else had the same & if so how did you fix it.

Thx
Alan

Thanks - I did not find that on search. Off to try some of this out.

OK - suspect most of that is 1.5 specific as my boot / trunk floor is different. There are however things bolted through the bottom of the floor with dried out sealant / gunk around them. Might try some holt melt glue or similar.