Sometimes you make a pinball deal because the price is great, but you’re not sure if you can restore the game or even if you should. But if you’re patient, everything falls into place. This is one of those stories.
Continuing the ongoing saga of restoring a Williams Earthshaker, in this episode, I take a look at the backglass and go over some basic ideas on how to preserve and secure an old backglass from further flaking and damage..
After waiting awhile, let’s take a look…
Ok… we wait awhile and check it, and add some more coats..
So what do you do about clear areas on the backglass? You need to avoid creating any kind of “haze” that obscures score reels or other things that need to be viewed behind the backglass/translight. Here is how we deal with that:
Some additional tips:
When you work on the backglass, make sure the humidity and temperature levels are moderate. It should neither be too dry nor too humid, but err on the dry side where possible.
Avoid cleaning either side of the backglass until after it has been treated, especially the screen-printed side. Even if the screen-side is dirty, it’s best to seal in the dirt, rather than clean it and run the risk of causing the backglass to flake or crack. However if you want to dust it with something like a Swiffer, you can try to do that, but again, be very careful that the Swiffer doesn’t hook on to any flaking and pull it off. Ultimately it’s best to seal the screen-side before even trying to wipe down the front – you don’t want to risk getting any moisture on the screen side until it’s sealed.
Make your first 2-3 coats relatively thin. Don’t slather on the Triple Thick unless you do it after several coats have dried and started to seal the backglass well. There’s a lot of evidence that moisture if subjected to certain types of screens, can cause the backglass to wrinkle and peel off catastrophically. So take your time and put a few very light coats on at first and see how the backglass reacts.
If you may have any loose flakes on the backglass, be very careful with the first few coats of Triple Thick. Watch your spray angle and spray downward instead of across or you might risk blowing flakes of backglass around.
Spray in a well-ventilated area, or immediately leave the area after spraying
Avoid subjecting the backglass under any conditions, to freezing temperatures. This may cause the various materials (containing different amounts of moisture) to expand and contract at different rates and cause cracking and flaking.