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The plastic is a bit heavier than water and should sink, however in practice I have experienced that 2x4 bricks (and the like) have a tendency to trap air inside them and actually float rather well. It probably isn't failsafe, however for shorter periods of time (like a half to a full hour) would probably work fine. (I haven't actually tested the time it ...

A few years back there was this solid single-piece hulled police boat which would float. There was also a small red boat (pre-2000) that came with part of a pirate set (I believe, anyway) As for building a boat from scratch...no. It tended to capsise then sink (somewhat impressively). Place 2x 4x2 bricks on another and place in water, they only float on ...

i had a police-boat when i was a child that had a one-piece-body, so it was watertight and able to swim: there are some other LEGO-boats with similar bodys (even some bigger ones) that should also be able to swim.

I would try liquid latex (liquid frisket) which you can buy in most art supply store. This can will not damage the bricks and is easy to peel off. You can apply it using a cheap throwaway brush, either in between the bricks (like a cement wall) or as a thin transparent layer on the whole hull. I recommend the second method because it's fast, straight ...

My kids had Captain Redbeard's Pirate Ship - it certainly floated in the bathtub! I believe many of the other Lego pirate ships could float, particularly if they had molded single piece hulls - see this list.

For a very small "boat" - something like a 4x8 plate with 1x8 and 1x2 brick sides it might stay afloat for a short amount of time before the leakage takes it down. For larger stuff, LEGO is just too heavy when you get in to building the necessary structure for a real boat. There were some sealed-hull boat sets I remember from childhood that were designed to ...

Already a correct answer accepted, but... the original question seems to be "do Lego bricks float by themselves?" Most Lego bricks are made of ABS plastic which has a specific gravity greater than 1 (but only slightly). So, they are heavier than water and will not float naturally. You can get small bricks to float initially since small bubbles cling to ...

I would tend to suggest another non-waterproofing solution - build something to hold your ship from underneath, that will safely rest on the bottom of your pool. Of course, if you don't want it to show on the picture, you'll have to be extra careful about how you do it, but I think it's the simpliest solution. What I would do is buy a large plexiglass ...