Model Forum / Radio Controlled / Land Models / June 2004

IME, foams chunk if they're not properly glued down at the outside
edge.

I make a point of inspecting my foam tyres after every meeting (4-6
runs): I work round the outside edge of each wheel, gently trying to
lift the edge of the tyre up, and if any gaps appear I squeeze a small
amount of Evostik Impact into them, and allow to dry/cure thoroughly.

Using this technique, most of my foams have worn down to about 2mm /
0.1" thick before suffering any serious chunking (although I'm talking
4WD buggy and 190 mm Pro-10, not touring car).

HTH,
Jonny

My limited use of foams on asphalt/cement on touring cars, leads
me to say that 20 runs might be normal. The racing surface, temp,
car set-up, and amount of stones on the track all come into play here.
Any small tear or loose point in the gluing will go first. A small tear
becomes a big chunks in no time.
The shore number may have some impact, softer = more chunks.
Look at the wear patterns, they may give you some clue as to the
cause of the chunking.

Hope this helps.

John