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Re: Technique decking HV urethane esp in colder temps

Thank you for the reply Clyde. The glass ended up being flush w/ the roof, not above it but not recessed like I have seen looking at other examples of this truck. Which is why I wanted to reset it. I had also read Bob Baranek's article on exposed edge glass where he noted the roof crush support that comes from the glass against the top pinchweld wall.

I measured an uncompressed bead of urethane I had gunned onto a piece of cardboard before starting and I found that the base is much wider than I expected. Although I notched the nozzle to about 0.30" wide at the base, the gunned bead measures more like 0.45"-0.5" at the base. I think the cold, stiff product was flexing the nozzle as it forced out, making the bead wider tan I expected. I am guessing that the bead being so wide at the base probably didn't make decking the glass any easier. I had read on here that technicians know from experience that in colder weather they can notch the nozzle to produce a taller, narrower bead that will deck easier.

I had left the tubes in the house @ 70F before using them but they probably cooled down pretty quickly by the time I got going.

As far as decking the glass, should pushing firmly be enough, or is slapping the glass ever acceptable to get it to deck down on a stiff product? Steve

Re: Technique decking HV urethane esp in colder temps

Please dont slap the glass. the urethane will be compressed quickly but will rise again quickly causing air bubbles.

Re: Technique decking HV urethane esp in colder temps

Thank you, Slappy, I will focus on sizing the bead more accurately for the application and ensuring I am not working in too low of a temperature for the product.

Re: Technique decking HV urethane esp in colder temps

Thanks again for the tips. I cut the glass out without damaging it (what a relief, this was a new OE acoustic shield), triangle notched my nozzle to about 0.3" base x 0.6" high, and decked the glass so that it sits 2-3mm below the roof line now. I used a BMW glass decking template I found online that I printed to scale on card stock to measure how far the glass was set below the roof line. I had to push a lot harder on the glass than I expected to get it to deck down. Not used to working on such a big vehicle w/ more limited reach. Good to go now. -Steve

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