Have one of these surplus, but it must have been common for the included glue tube to leak as this has blighted both kits I have!
https://www.veb-plasticart.com/mercure
In this case it has damaged a section of the upper stbd wing (filled but not fully cleaned) and the instructions and ruined the decal sheet.
I have included replacement decals for F-WTCC, the prototype in Dassault house colours - https://s3.eu-west-2.amazonaws.com/abpi ... -large.jpg
Here's the final paper test shot being matched - https://ibb.co/J2vRjmL
Others are also avail - https://www.f-dcal.fr/decals/index.php? ... &id_lang=1
Asking $20 plus postage from Tweed, by Paypal "friends" to - https://ibb.co/f3u7DA