I'm going to take a shot at this... using a thick milkshake and water as an example..
Take two identical straws, one in the water and one in the milkshake. Now take a swig from both. Notice the amount of effort it takes to pull a milkshake through the exact same straw as it took for water? Now equate the milkshake being paint and the water being, well, water.
Now lets turn it all upside down. Put a lid on both cups, straws in both.. turn em upside down.. poke a hole in the top for air to enter the cup... which will drain out faster? Water. Why? Because the viscosity of the milkshake prevents any decent amount of flow through the straw.
That's exactly what he's trying to get to you about your idea of filling up the radiator with paint.. it ain't gonna work due to it's viscosity.. and anyway.. it's probably a dual pass, so you'd have to have something to *force* it through to get the entire radiator filled. Got a pump you're willing to sacrifice for the efforts of painting the interior?
Seriously, just save yourself the cost and effort and buy some water wetter or anit-freeze and add it to your cooling loop. It's just better in the long run.
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Originally Posted by muffy
obviously the paint does not totally insulate the radiator totally other wise like, what your getting at the radiator will not work at all. but any paint should insulate or decrease the efficiency of the radiator to a small degree. i dont see that the thickness or viscosity of the paint has anything to do with weather or not you can fill the radiator up with paint or not. you can also ad thinners to the paint if you want too, though it wont ever be as runny as water.
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Edit: Gah.. my spelling bites tonight.