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Pretend I have a Lego ship that I want to photograph as it's sailing along in a pool. Of course the Lego bricks have cracks in between them so water will leak through. Anyone have any ideas as to how to waterproof the hull? Something that won't harm the bricks that can be easily removed. Also I don't want whatever the material is to be visible in a photo.

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Are you going to build something like this? –  Jakob Oct 17 '12 at 9:28
    
Holy smokes! I've got a Lego pirate ship (it's my brother's actually). It's the Black Sea Barracuda. –  mj_ Oct 17 '12 at 13:52
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5 Answers

I would try liquid latex (liquid frisket) which you can buy in most art supply store.

This 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 forward and the easiest one to clean up.

I use this stuff for all kind of painting and molding jobs. It's a great material.

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I use liquid frisket for art too. It's an excellent suggestion since it is easy to come by and also removable. –  Lynnea Taylor Dec 23 '12 at 1:39
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Maybe clear contact-paper on the inside?

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Maybe you don't need to waterproof it. If you are able to fit a block of foam (eg. extruded polystyrene) inside the hull, that will probably be enough to ensure flottability.

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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 sheet (or any other transparent material), make sure your ship is secured to it (drill some 8mm holes in the plexiglass and poke studs in them, or Technic Axles, or whatever). Then you can have someone hold the sheet & ship slightly under water so that the ship looks like it's floating, whereas it's actually not. As long as the borders of the sheet are outside of your camera frame, you're in business.

I owe that idea to a Stargate SG-1 episode I rewatched recently, actually. In the making of, they explaing how they make it look like a bullet is floating in mid-air - they just embed it in a plexiglass sheet and film right through it. It's it's good enough for commercial television, it should work for you too.

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Try spraying the inside with plasti dip, it goes on like spray paint or you can use a cheap paint brush, then you can peel off as one whole piece. Best of all it comes in many colors!

Get it here www.plastidip.com they also sell it at most home improvement stores.

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