This is what I did for my scope if you were interested, it's on the resin kit though and not a Hyperfirm (I wish I could have one!). You might need to do some "reverse" weathering on it to put some black back. The thing you need to be aware of big time is that there's different shades of black and you should test it out first. Also painting on rubber is tough, before painting I would give that section a bit of a wash with warm soapy water to get rid of any potential mould grease.