How to avoid losing screen sensitivity after OCA glass replacement?

"Have you tested using less glue?

EDIT: following Ged's comment, let me rephrase, and please note that I have no practical experience with refurbishing. I'm just familiar with the physics of it:

Have you tested with thinner sheets, or if there is no such thing, can you use LOCA and try varying amounts and test?

Or just do multiple tests while changing 1 variable at a time: the glue thickness or quality, curing time, etc.

It seems from the people doing it this side of the world, that better results are obtained with LOCA anyhow. Some opt for OCA because it seems more controllable and less messy, etc. but they're not very happy with the results."

Can be that you dont add the anti-static silver conductive paste (the thin silver line at the top) it can cause issues.

"If your screen looks like it has static use the paste http://stsparts.us/products/conductive-p...

How are you cleaning your polarizer glue? Make sure the lcd is completely clean before new polarizer application. Another common mistake is to damage the flex on top. Make sure to take polarizer off from top to bottom"

I've started adding a product called "conductive paste", applied on the top edge of the screen. Issue solved!

I would say this is something to do with the OCA. I've bought polarizers before and they're never quite just right, some are way too light. I'd ask some suppliers if it would be possible to buy 1 sheet of what they use as a sample. @Rany, I don't think you have to remove the backlight when using OCA because of how controlled it is. I assume OP uses a machine to automatically slice the polarizer off and then a vacuum laminator to reapply it, either way there's still no need for any liquids to go near the backlight of the LCD.

"I faced the same problem that you faced it's not about static issues but it's about lcd thickness and glass and OCA the real problem is before we remove glass it's working fine right! also after applying Polarizer it's fine ! also but the problem appear with the two following steps after Vacuum Laminating Machine and After Autoclave most of them after Autoclave for iPhone 6 and 6 Plus I did about 40 - 50 LCD's all same issue so there must be something wrong !!! I found the problem but don't know how to fix it the problem is again it's about the lcd and touch contains from layers vertical and horizontal not visible for human eye so after the pressure the edges of the lcd under the glass it curve so the touch will not be responsive for sure ! but you can still get touch sensitivity if you press hard on glass it will respond so please if any one got an idea how to fix share us please we paid large amount of money and of course we don't want to lose our friends and customers I used anti static pen same problem I used LOCA no problem !!! 100 % working so please we need a solution for OCA iPhone 6 and 6 Plus LCD's

thanks a lot"