It’s probably under exposed then. Something like this and this will help you tune your slicer settings. You might need to play with other settings if you have other issues, but most of the time the exposure settings will be the problem with new resins.

Is this the first print you’ve done with it? Have you done any exposure calibration with this resin?

Ethanol should be fine to use as far as I know. Do the holes go all the way through? If so your screen might have dead spots. You can visually inspect the screen by setting it to do a test exposure without the resin tank on it to check. Also obviously check that your tank doesn’t have any failed print bits stick to the sheet.