Painting Flexible Things?

[Nanako]

Hi all, i want to permanantly paint, dye, or in some way change the colour of, things that really don't want to be painted

1. I have some trainers with semi rigid synthetic soles. Some kind of rubber or plastic. Specifically on the side of the sole area, its slightly softer than normal rubber, deforms easily when squeezed. I've not attempted painting these, but any colour i put on them needs to be able to survive the washing machine

2. Rubber door seals, attacked to the doorframe and carefully positioned on little plastic rails nailed in, they get squished to block the airflow when the door closes
These are under constant mechanical stress from said squishing, i've tried using silk emulsion paint on them, and after a few days of doors opening and closing, the paint just flakes off under the stress

I would like to paint both of these things in black, in a way that will last and survive through the stresses they are put under

any idea how? Can it be done?

 

[robinbanks]

Trainers; tempted to say forget it/no chance. Finding something that will stick is the first hurdle, finding something flexible enough the second, durable (being thin will mean flexible, but it'll get kicked to bits if you catch your feet on each other as you walk, let alone the environment) the third.
Maybe liquid radon barrier, or plastidip- liquid rubber products that stick quite well and dry black but, I have doubts

Door seals; can be purchased afresh from eBay for pence. Search for "bubble gasket" if your other searches bring nothing. Many sellers will have a multi-choice listing that lets you select something, and the design you pick doesn't have to match the existing exactly, just something that will fit well (usually listings like this then have a picture of the profile with measurements when you choose one)

To get the existing strip out you might have to cut a bit out of the plasticprofile to give a gap you can slide the new one in through, but all those pictured above are just a press-in job, so however you manage to get the old one out, eg attacking it with a slim screwdriver if it's a "rubber bubble mounted on a harder plastic backing strip" type