Getting rid of warping, part one.

The printer has been running quite much lately, and everything is running fine. I've been trying to avoid printing large prints due to the warping problem. I thought I would try to fix this, or at least minimize it so it´s negligible.
In this first part I'm trying out a new platform adhesive paint.

First part of minimize warping for me is to find something better than the green silicone paint (or what it is). It works good for smaller prints but it is a bit tedious to get an even layer and getting some prints to stick.
So far I've been trying out the blue 3M masking tape (7090) although I didn't have to repaint the platform the prints pulled up the tape when starting to warp. So I needed something that was easy to apply and stuck good to ABS plastic.

I have been using acrylic sheets when printing large stuff and got away from warping but the acrylic sheets didnt last that long and it I needed more heat from the platform. So after searching some I set off to try out acrylic spray lacquer used on PCB boards. It is available in a spray can so it should be easy to applicate on the platform.
And sorry for the bad pics, low light and wrong settings!

It´s really not that easy to tell from the bare surface.

Trying out a smaller print to see if it stick and it sticks real good!

Trying out a larger print that I have had trouble with warping.

So far so good!

Slight warping but only about 1mm compared to around 5-10mm before.

Finished printing and It´s looking good! At least a lot better than before.

You can see the warping here and it´s really not much , may be possible to
print a larger raft to get the print completely unaffected.

My calibration and squaring made a huge difference in this print so now
things works as it should!

This is the spray paint I used, I think automotive acrylic lacquer
would work as well as this, this is just what I had available at
the moment.

I think I´ll use acrylic lacquer from now on, the application takes me seconds and I don't have to think about getting an even layer since it pretty much does that itself. The prints sticks better to this, much better. But it´s really not hard to remove using the spade. Once the platform has cooled it snaps off pretty easy, it's harder to remove when its hot/warm so wait until it cools of. I usually remove the plate and splash cold water on the underside and I can instantly remove it.

This has allowed me to print larger things without much warping. On the item itself it´s not really noticeable. the raft took most of the warping. I only got about 0.5mm on this item.

Next thing to try is to bump up the heat on the platform.