Bob---Did my own rapide 2 years ago, bought the seal strip from broadlane caravans in Alcester (on line)---white spirit is very good for removing old sealant, also when you install the new seal make sure you bed it in correctly at the corners, use the wife's hair drier to soften the mastic and the rubber (the new seal strip will have a layer of mastic under the lower lip.) Once the strip is in and you have a nice joint, pin it down into the wood (use a staple gun )---if you are replacing the old grey type of seal strip then you may find that you will have to put shims under the window latches as the new stuff is thicker---hope this helps----also shop about for a good price, I found that it varied quite a bit --- can't remember what the price was ---maybe