Demsy said:Try to wet the glue side of the sticker with soapy water, then position it on the also slightly wetted surface. Take a small plastic triangle ruler covered with kitchen tissue paper and carefullly squegee the fluid from under the sticker, slowly work from the middle out. Once all the fluid is carefully squegeed out, there will be no bubble visible. You can also reposition the sticker when needed while working the fluid out. You can also use glass cleaning fluid for this. Once done, give at least 24 hours to let the fluid to dry completely out.
This is a trick used when we have to put stickers on the model airplanes, on either painted or plastic filmed surfaces.
Hope this helps.
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