The info below is from the CARS Rulebook NRR 1.A.6

My interpreatation of this unless the Manufacturer approves no you cannot.
There are I believe certain companies approved by Helmet Manufacturer who are approved to do painting.

Not however a DIY project

Pete g

No helmet may be modified from its specification as manufactured, except in compliance with instructions
approved by the manufacturer. Hardware may be mounted on a helmet for FIA approved HANS devices,
provided the hardware is installed in accordance with recommendations provided by the manufacturer
of the helmet and/or the devices. Competitors assume the risk of any modifications to their helmets. Any
other modification will render the helmet unacceptable.

The fitting of earplugs and microphones may be done only in respect of the paragraph above.
Paint can react with helmet shell material and affect its protective capacity, therefore, where a
manufacturer provides guidelines or restrictions on the painting or decoration of helmets, these must be
followed, using only paint specified by them (air drying acrylic, polyurethane enamel or others) and
preferably a painter having their approval. This is particularly important for injection-moulded shells which
are not usually suitable for painting. The shell being painted should be efficiently masked as paint
penetrating the interior can affect the performance of the helmet liner. Paints requiring heat curing should
not be used and any process should not exceed the maximum temperature of conditioning of the helmet
in the standard to which it is approved. The manufacturer's instructions should also be consulted for any
considerations on the use of stickers and transfers.

How about a "helmet wrap" Mr. Blomqvist? It is tough though, because for some reason we do not have square heads, but round ones. I remember putting a big maple leaf on my off-road helmet. Even I did not know that my swear word vocabulary was so large...

I read the rule in such a way that you can paint, but only using Manufacturer approve paints and process to say within the FIA or SA rating of said helmet.

Researching my own new helmet, this information is not online, however have placed calls to 3M and paint shops in the UK and waiting to hear what 3M have to say officially.

The rule doesn't say anything about stickers though right, or am I missing that.

JD

I think it will have to be stickers then....

JD