How to apply Goo Rear Projection Paint
Screen Goo Rear Projection is a single bottle spray only solution with no primer required. Sprayed on a suitable substrate to create an excellent Rear Projection screen, with a good image on both sides.
Suitable substrates include Glass, Plexiglas, Polycarbonate fabric, Lexan/Polycarbonate in Clear (fully transparent) or slightly Tinted varieties up to 6mm though some have used 10mm.
The further away the projector is from the acrylic/glass the sharper the picture, because there is less refraction through the substrate. The thickness of the substrate also comes into play with the refraction
As Goo RP is an acrylic paint it bonds well to acrylic sheet. The trick is removing it, however this works to our advantage for projected water features etc.
Remember to use a surgical alcohol or similar to remove the residue from the protective film that would have been attached to the acrylic at the factory. If you have a choice between cast and extruded acrylic, choose the cast to minimise stress lines especially if the acrylic is being curved.
Goo RP cures over time to a very hard surface, and has been used with front projection to preserve the screen when its exposed to footfall and the like.
Goo RP on glass, after it has cured, can be wetted for 30min and peeled off the glass.
Familiarity with your spray gun is more of an issue than the type of spray gun used.
Do not use a cheap garden fence sprayer.
Good results can be obtained by using an average quality HVLP (High Volume Low Pressure) spray gun.
A favourite is a Graco TurboFource 9.5 with a 140 needle.
Before you spray, clean the spray gun with water – if you previously had a solvent paint in it, dismantle and thoroughly clean the spray gun.
Godliness is cleanliness with the spray gun.
The Goo Rear Pro comes as a one bottle solution. The first coat needs to be a very thin coat to provide a key onto the glass or acrylic. Then a competent sprayer could complete the project with 2 or 3 further coats.
For a general sprayer it would be advisable to double the amount of coats but make the coats thin - volume used would be the same.