Start with a clean slate
As Alexander Graham Bell puts it so beautifully “Before anything else, preparation is the key to success.” A quote with 1000 truths! The chance that your bus that you want to convert is not a new example is rather large. Our Debie also had a richly filled history before we gave him his 2nd life as a tiny house on wheels.
Before we started, we completely gutted our bus, cleaned the wooden floor from everything nicely, it's unbelievable how much dirt gets in between everything.
Rust is certainly also an important factor in older buses, to avoid problems afterwards, it is best to treat all rust as well as possible before starting construction. Hammerite is a top product to treat superficial rust spots.