I used a slime type product (Puncturesafe) in my motorbikes following advice from my Bike Instructors and local Police Motorcycle Officers.
There was no affect at all on the tyre balance.
It was used to reseal small punctures or help slow down the deflation of a larger puncture (on a bike the quick loss of air is very dangerous.)
The only time it was needed was a rear tyre on my bike picked up a metal fragment when two up and loaded with lugguage .... it meant I was bale to keep control of the bike and slow down, moving into the inside lane then hard shoulder safely.
The tyre was no repairable, not because of using the Puncturesafe but because of the damage by the metal fragment.
Tyre fitters do not like it because of the extra time and mess of having to clean it off the inside of the tyre in order to repair them.
The local Police used in in their cars and vans as well as motorbikes but I only used it on the bikes as if having a puncture on the car I always carry a spare (not possible on a bike).
i dont think caravan punctures are mostly caused by side wall blow out at all.. what appears to be a side fall blow out is simply caused by the tyre shredding because the driver does not stop when the tyre goes flat (soft) and the tyre ends up shredding and doing damage to the van..
people assume when they see a shreded tyre that there has been a side wall blow out.. this may be obvious thinking but its wrong thinking..
there are two myths at work here caravan tyres are being worked harder than car tyres.. they are not in fact they have a pretty easy life.. the other myth is the obvious thinking when looking at a wrecked tyre..
as for rubber showing slight cracks with age.. this will not affect the structure strength of the tyre in the slightest.. the strength is in the side wall canvas the rubber covering plays no part in this..
the good spreads evenly around the tyre as it rotates it will not cause any out of balance problems..
the same happens with lorry tyres the tyre is run flat (unnoticed) gets hot and shreds..
the problems is the damage done to the van when the tyre shreds.. it can be nasty..
my advice to the OP.. have the wheels balanced (not essential but why not it dosnt cost that much) use the goo it wont do any harm and may do a lot of good..
trog
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hi if you got it on your mind that every time you take the van out you will get a punture you will be a wreck by the time you get to a site tyron bands are the way to go forget the slime cheers tom
Thanks to all who have contributed, I've found the various views interesting and informative.
I've decided to have the new tyres balanced, and then to add some 'Puncturesafe' as mentioned by ST1100.
I got a quote of £185 for Tyron bands - but I don't think we'll be keeping this van long enough to justify that cost.
The 'puncturesafe' ad seems slightly more realistic than the 'Slime' claims - that is, if it doesn't seal the puncture it will at least give a controlled deflation. A controlled deflation will be fine - I just don't want vicious lengths of steel belted radial destroying the wheel arch.
Ultimately, even if it's just a placebo, it's a relatively inexpensive one and will certainly help me to feel better, at least...