Should I use any kind of paint thinner before priming or should a good sanding and cleaning with an air hose and some soap and water be good?
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We've done 2 Jeeps with Herculiner. We didn't use primer on either. One of them has lasted three years or so with no issue. The other was just done last year. We used rough sanding pads in the corners and curves just enough to scuff off the gloss. On the flat parts, we used a palm sander with 120 grit I think. When it was all sanded well, we used a shop vac to get out the dust. Then we used acetone and a rag and wiped the entire thing out really well.
Then about 5 minutes before brushing on the bedliner, we used acetone on each section one more time just to be safe. It worked just fine. No issues with peeling at all.
Tips that helped:
1)Instead of taping off certain areas for masking, use aluminum foil. You can mold it around just about anything (pedals, seat belts, etc).
2)For all of your bolt holes, use foam ear plugs to protect them. They will expand into the holes and keep the bedliner from sticking to the threads. Make sure and leave enough hanging out that you can grab them with pliers when it's all done.
3)If it's not windy, let it dry outside for a full day. It will reek for a good week or so, try to leave doors and top off during those first two weeks.
