Rainbow War (1985)

Overview

Rainbow War was featured in the Canadian Pacific Pavilion as part of Expo 86 in Vancouver, BC, Canada. It is available on DVD and Blu-ray from Pyramid Media.

Trailer:

A fan site has more information about the film, its cast, and its production history.

Plot

Three nations with strong ideological differences go to war when new technology brings them into contact with each other. Blue King, Red King, and Yellow Queen:

Not everyone finds their differences repulsive. Yellow Boy and Red Princess:

The three sides in the battle discover that their differences can combine in beneficial ways and that they have much to gain by working together, which leads to peace:

Various scenes

The hero is some kind of tinkerer/inventor and creates a large hoop that enables him to fly. (Picture Vitruvian Man where the circle is a yellow hoop, except he's wearing a yellow jumpsuit.)

The hero returns to the yellow nation where he is immediately arrested and dragged before the ruler (queen?). He presents her with the rose and she glares at it until someone douses it with yellow paint, at which point she picks it up and smiles. Nastily.

The blades of the Yellow Queen's mask ordinarily lie flat against her hair, but they move to new positions when she feels strong emotion. In this scene, the outermost blades swivel forward, accentuating her menacing smirk.

The hero is put to work building more flying hoops. Some time later, troops of yellow painters (yellow coveralls, yellow power-rollers, yellow backpacks full of paint...) are sent flying to the red nation. At the same time a huge (blue) hot-air balloon takes flight from the blue nation, and they converge on the red nation.

The yellow and blue contingents start painting the red nation, which fights back with a huge machine that I recall looking like a gigantic (red) fireplug.

Seems like it is Rainbow War.

From Wikipedia:

The story takes place somewhere there are 3 nations, each on its own cloud.

Once upon a time, in a timeless place, there were three kingdoms: one blue, one red, and one gold.

The hero is some kind of tinkerer/inventor and creates a large hoop that enables him to fly.

In the Golden kingdom, a young boy creates a flying golden ring, large enough to carry a man. Using it, he leaves the Golden kingdom to explore the other lands.

The hero encounters a young woman dressed entirely in red. Guards (in red) chase him off, but she gives him a red rose.

The Yellow boy lands in the Red kingdom, and falls in love with the Red princess, and she with him. He gives her his golden scarf, and in return, she gives him a red flower.

The hero returns to the yellow nation where he is immediately arrested and dragged before the ruler (queen?). He presents her with the rose and she glares at it until someone douses it with yellow paint, at which point she picks it up and smiles. Nastily.

Upon arriving, the Yellow queen hails him as a hero. But when he offers the red flower to her, she is offended, and the Yellow guards take the boy away. The Yellow queen then realizes that with the golden rings the boy has created, she can invade the other kingdoms.

The yellow and blue contingents start painting the red nation, which fights back with a huge machine that I recall looking like a gigantic (red) fireplug. Of course blue paint meets red paint, red paint meets yellow paint, yellow paint meets blue paint, and everyone marvels at the new colours.

Meanwhile, in the Golden Kingdom, the Yellow boy is being forced to make golden rings for the army. He manages to outsmart the slavemaster though, and escapes. Back at the front, the battle is still going colorful and strong. But when a volley of blue and yellow paint collides, green is created, and the soldiers from both sides stop fighting, very interested and happy at what they have created. The Golden queen will have none of it however, and commands her troops to continue fighting. The battle resumes. The Red army, using a giant fire hydrant, coats the whole area with red paint, and when it mixes with the other paints on the field, they discover orange and purple, and the soldiers from all sides again are entranced and overjoyed over these new ideas.