this is one of those times you kind of know the answer but someone may have tried , so im going to ask anyway.
yesterday i thought id give this tyre sealant goop a go. the trouble with the product i found is that although the bottle of 500mls is marked you only need 250ml per tyre. when the bottle has had time to settle the markings v product are clear to see, once you invert the bottle to use it , its as cloudy as mud and you cant be sure how much youve put in , even taking the bottle off to put the right way round doesnt help unless ( i know now ) you leave it a good 10 mins to settle and then you can see product V markings again. so net result is i thought oh ive probably but a bit more than half in, valve back in and re pressurized the tyre and took it for a spin , only to find once back the product had settled to show i hadnt put nearly enough in.
in theory thats it , your fooked ! as you cannot add more logic says attempting too will clog up the valve as if it were a leak etc and i dont know what chemically happens to the mix if you attempt it ?.
it might be possible to slowly let the air back out holding a towel over the valve ( be messy !) replace the valve core with a new one and then top up with more product or the balance of expelled plus what didnt go in first time.
anyone done this successfully ?