hull cracks

Hi fellow sailors, This forum is absolutely amazing. And special thanks to @stickinthemud57 for great introduction and long and detailed emails. Hopefully, we can continue that here as I make progress. Here's my story and I open this post with ask for support and advise from experienced people...

I just discovered after my boat was haul out a good size crack in the floor of Catalina 315. It occurred on the fiberglass part in the aft cabin. On close inspection it seems that the tabs which attach the shell to the hull have come off in the area. The tabs seem to be only 2 inches wide...

We launched on Friday with no trouble and I piloted Brio the 20 cold minutes to our marina. We began moving in and as I was stowing some items in the starboard quarter, I noticed cracks in the area under the berth where the stands had been. One crack was wet and seeping; fortunately slowly...

Looking to purchase a 2003 Hunter 146 from a friend. Boat does not have any visible cracks on hull or anywhere. We had a previous Hunter 140 that developed fatal cracks in hull and boat had to be scrapped. Checking with other Hunter 146 owners on their experiences. Thanks in advance.