hi chris i had double sided mdf sign units to do, tested one with primer and one without, the one without primer was best, i just cleaned mdf properly mounted vinyl then ran it through the laminator to give it some heat and the vinyl stuck perfectly 😀
Almost any vinyl sticks to MDF. On uncertain surfaces, an adhesive promoter, in an Aerosol or in bulk 4L tins and sprayed can be bought. On MDF I use the promoter on alledges, does not fail, ifyou try remove vinyl, it will shred the surface of the MDF.
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