If it's the Claytonrite style rubber i'm thinking of,this style of rubber is prone to this,especially on tighter corners.
Due to the insert/lockstrip opening on the outside face,this allows it to conform to the shape better whereas the inside is solid and tends to pucker.
You can lessen the look by gently heating the rubber with a hot air gun,be careful not to melt it,overheat the glass or surrounding paint etc.
Once it's reached a reasonable temperature gently persuade it into the correct shape with your fingers,wear a glove if you wish.
Try and hold it in 'til it cools slightly.
I hope this helps.
Last edited by jockbolter50; 07/02/2012 1:23 AM.