fix UM´s BA10M rubber tyres to the rims? What are these tyres made of? They seem to be totally inmune to all kind of glues...

The UM rubber tyres are deadly in contact with plastic - in one of my T-34 kits the sprue of rubber tyres has "eaten into" the plastic sprue it was next to quite considerably! Luckily no serious parts lost, but I wouldn't put any of that UM rubber next to unpainted plastic.

Jolyon

Thanks for your advice...I would hate that.
It has been possibly the most complicated 1:72 model I´ve ever built.

Just checked my boxed UM kits and the vinyl tyres were eating into the adjacent sprues.

Whatever were UM thinking including this gimmicky garbage in their kits? After all they have already seen the light and switched to L&L tracks, so there is no need for vinyl at all.

For what it's worth & all the best

I dont trust those wheels. I started on one UM T-34 but refuse to use those wheels. If they dont melt the plastic they probably will crack instead. I read that a layer of superglue is even better than paint between the plastic and the rubber. I have a couple of UM GAZ AA so iI probably start with superglue and then paint the plastic.
Björn B

I use Elmer's clear epoxy a lot-sets up quick, grabs right away. Perfer it to CA for most PE, actually. Used it on the 1/35 scale Sahariana tires-worked fine

Hi; as folks said, UM "rubber" is like WP judging their effects in plastic! I simply discarded the rubber bands in my T-34s, replacing it with bended plasticard stripes, but when you have have to use more complex tires I would reccomend yo to make a mold to have resin copies. The "health" of your models will be grateful with you
Cheers: Luis.

Looks like the best option are resin copies...But these are out of question for too many reasons (The most important is that I haven´t got any idea of where to get and how to use resin )
So I´ll have to go with some of the others... Maybe a ciano layer between tyre and rim or even the same with acrylic varnish and then a two part epoxi to fix the tyres to the rims...I don´t know if this litlle ----- is worth the effort. In the end is just a BA6 with a new turret an no rivet detail...Lots of work to make a acceptable BA10M
Fortunately my only other "UM" is a BA5 that will be a Spanish Republican and it has L&L plastic tracks

In the past ACE made a beautiful set of hard plastic wheels for their GAZ AA truck release. I purchased a couple extra of these kits some time ago just for the wheels to put on my UM BA3 armored car.

I have the bare rubber wheels on the naked rims of a BA-3 under construction. It's been like that for a couple of months with no problem. Has UM modified their formula or does it take a few months to react? I can still pry mine off if I have to and paint them.

When I opened the box they were in a bad state just after I bought it.

Now, this means it's possible the parts may have reacted because they were new, and maybe it's less of an effect the longer it is after the parts were moulded - but I honestly don't know.

But if you can remove the tyres without causing too much disruption, I would advise it.

Jolyon

Has somebody tried to wash these parts? Could it be caused by the mould releasing agent?
Anyway the tyres have been mounted on the rims for more than two months without any apreciable damage so I think it is very unlikely that it could happen right now. But still I am not able to glue them althought they glue perfectly well to my fingers, extrange, isn´t it?
Cheers...

Well, as you probably know i´m quite fond of the UM kits, so when i saw this post i rushed to the cupboard and looked through all my unbuilt UM kits with rubber parts. All 15 of them. I only found any sign of "melting" in one kit. It´s one of the old Skif ZIS-3 ATGs. The process was only beginning and had just effected the sprue. On those already built (eight T-34s and two ATGs) i could spot nothing, no breaking nor melting. I haven´t glued nor painted the rubber, just weathered it. The oldest of my UM kits are several years old now.
Just to be safe i removed all the rubber parts from the boxes and washed them with detergent. I´ll keep them separately from now on.
/Peter