I've had great success exposing my screens using the sun. I expose them for about 70-80 seconds with no problem on sunny afternoons. However, the past couple of weeks have been terribly cloudy here in the SF bay area and I need to expose some screens urgently. Is it possible to expose on a cloudy day and if so for how long? I don't have any exposure unit except a halogen light that I have used but it took way too long (about 30 min and even then the face side wasn't fully cured).
I've had great success exposing my screens using the sun. I expose them for about 70-80 seconds with no problem on sunny afternoons. However, the past couple of weeks have been terribly cloudy here in the SF bay area and I need to expose some screens urgently. Is it possible to expose on a cloudy day and if so for how long? I don't have any exposure unit except a halogen light that I have used but it took way too long (about 30 min and even then the face side wasn't fully cured).
Thanks again,
T
That's difficult to answer. I would try double time and see where you are at with a test screen. And go from there.
Been there, done that. It wasn't until I figured out how to build a decent exposure unit that I had success screen printing. It's all in the screens. There are a lot of posts about building exposure units. I'm sure you could build one that will work, rain snow sleet or shine. And probably for less than 150 bucks. Good luck.
I built an exposure unit for under 100 bucks....but it is made out of old pallets that I got for free...the only thing I bought was the light fixtures and bulbs.....now I need a thicker piece of glass...the one I use is bending from the weight I use to hold the film tight to the screen....I use a 500 watt halogen for now....30 minute burn time are killing me.... 5 minutes to burn a screen with the unit below.
Exposing on a cloudy day 
