I have owned the Flashforge Finder 3D printer since June 2017 and am very impressed with the print quality however almost every object that I have printed in PLA has warped. Here are the adhesion methods I have tried:
Blue tape: first layer fell off immediately and stuck to nozzle
Blue surface that came with printer: first layer did not stick at all
Hair spray on glass side: stuck well but corners warped after 10 minutes of printing
Glue stick: first layer stuck for around 10 minutes then all corners began to warp
Heated Bed: There is no heated bed on this printer and no option to add one as most parts of the bed are plastic and would warp.
3DLac/other 3D printer adhesives:
Don’t want to waste my money as I have no clue whether they even work with cold glass
I, also, have the Finder and love it… once I found a way to get consistent adhesion for that first level. After experimenting with hair spray, assorted tapes, etc. I just couldn’t get that first layer to stick EVERY time with EVERY part configuration. Then, I did everything I could think of … all at the same time. 
This may sound a bit wacky. But, if you don’t want to use rafts (or maybe you do and you still get warping) you might give this a try:
1 - clean the original blue build plate with isopropyl alcohol
2 - lightly apply the glue stick (came with the printer) to the overall build plate surface
3 - apply several drops of alcohol on top of the glue and spread it around with your finger (objective is to get a smooth consistent layer of adhesive on the build plate)
4 - apply 3 inch wide painter tape (3M 2090 is what I use) at a 45 degree angle on the bed surface (helps prevent squared up models from pulling up an edge of tape)
5 - evenly heat the top surface of the tape with a hair dryer until it is quite warm, but not exceedingly hot … don’t want fire, just want the adhesive of the tape to flow better (I don’t know what the actual temperature is)
6 - immediately use the edge of a credit/debit card to apply pressure across the entire taped surface… the idea is to get the tape’s adhesive to firmly grip the adhesive on the build plate
7 - AND, then, lightly apply that same glue stick to the overall surface of the blue painter’s tape
Voila! You’re ready to print with total peace of mind!
If you haven’t used painter’s tape previously, you should check the level on the bed and calibrate the extruder at this point.
I know, I know … the above seems like a lot of hocus pocus and over the top. If you get perfect results with a naked build plate, more power to you. But, if your models are warping, lifting up painter’s tape, and/or tipping over and creating spaghetti piles … try the hocus pocus method. It really does work like magic!
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I also have the Finder. Have had it for about 6 weeks. I have been using the wide (2") masking tape with a lot of success. Having said that…it is not consistent. Nothing seems to be consistent, thus the reason for using hocus pocus on occasion. 
I have found that I need to level my build plate frequently and even then, I manually tweak that. It is just annoying to watch that first bead come out and not stick to anything and get drug around the platform. Considering that I take that build plate out EVERY TIME I PRINT SOMETHING, it stands to reason that it would get bumped out of level. The larger my print on my build plate, the more difficult it is to get it to not warp up. I have a difficult time understanding why it doesn’t warp until, sometimes, 5 levels in. It seems to be sticking and then…it’s not. The tape itself sticks EXTREMELY well to the blue surface. I think I’ve found the best luck putting the glue stick on top of the masking tape. Wait for it to dry and then apply another layer.
I hope this helps someone.
