Latex Sealant in Tubulars

So, not wishing to completely hijack the other thread where this was mentioned, just what is other peoples experiences/ views on injecting liquid latex sealant into £50 race tubulars as a back-up against race ending punctures?
I'm used to riding my MTB with tubeless tyres and rims and sealant, but never with tubulars. Tubulars I've used in the past have been either binned or sent to someone to fix.
So... Here's a few questions:
1) how much liquid latex would one 25mm require?
2) are tubulars repairable by hand once they've been filled with latex, or is this like trying to operate on an intestine full of erm....waste
Also, liquid latex only lasts so long before it goes a bit "off", which is fine with tubeless MTB tyres as you can just scoop out the old gunk and refill- can't really do that with tubulars, so surely keep topping them up with latex will only make the sausage heavier and maybe start to counter all the good things one buys tubulars for in the first place?
I'm used to riding my MTB with tubeless tyres and rims and sealant, but never with tubulars. Tubulars I've used in the past have been either binned or sent to someone to fix.
So... Here's a few questions:
1) how much liquid latex would one 25mm require?
2) are tubulars repairable by hand once they've been filled with latex, or is this like trying to operate on an intestine full of erm....waste

Also, liquid latex only lasts so long before it goes a bit "off", which is fine with tubeless MTB tyres as you can just scoop out the old gunk and refill- can't really do that with tubulars, so surely keep topping them up with latex will only make the sausage heavier and maybe start to counter all the good things one buys tubulars for in the first place?
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I just keep an eye on Planet x for sale price tubs.. but at mo I have spares hanging up.
I just carry pitstop on rides and races.
I don't think I'd ever continue to ride a after a race on a tub after such a scenario without either replacing it or having it fixed, hence the fix-ability question.
I'm also not sure how latex in a tube would mess up the valves. Low pressure mtb tyres don't cause much problems, but I'd imagine the pressure of a tub at 100psi + would be enough to blow some sealant back thru the valve and maybe gunk that up.
Regarding PitStop, isn't that the foam type sealant?
I hated the feel of my MTB with latex in the tubes so would imagine it would indeed negate any benefit of using tubs.
Boardman FS Pro
I did put extra liquid sealant in afterwards, but superglue trick is not foolproof as tyres flex.. luckily i was on rollers when tyre finally had enough, although riding on a wet roller for 1 minute proved interesting...improved response times for sure.
I find that sealant does tend to "gunk up" the valves. For me it's a slight hassle, but nothing I can't deal with.