Over the years, especially in the last few weeks via PM's/emails, I have been asked how I bed deck hardware with butyl tape. I officially apologize for being so slow with completed photo examples. I have been meaning to do one but just have not had the time to complete it.
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Late one night I was in the barn staring at a cleat, and a small scrap of clear Lexan, hmmmm...... A drill, counter sink, some butyl tape, my camera and a few minutes later I had the pics I needed. Sorry it took so long it just needed to "click" the way I wanted to present it..
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Here's how I bed with butyl.
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Step 1 - Countersink the deck holes slightly and then clean everything with Acetone or a similar fast evaporating solvent.