I need to adhere a piece of indoor/outdoor carpet to 1/2" CDX ply. This will be used as a chair mat for my wife in her craft room. What adhesive would the BORG collective suggest I use? Is there any specific or special prep work that I should do to the ply? I tried some carpet adhesive that a sales clerk suggested at the store where I got the carpet, but the carpet just peels off of the ply. TIA.