Waterblasting at 3000 p.s.i. or higher is necessary at least twice during the preparation

process to remove remnant solubles. After Degrease & Rinse, and after Acid Wash & Rinse.

The water used should be low in dissolved minerals.

Tip should be no further than 80 cm from the surface to ensure good pressure.

Allow minimum 3 days drying, at 25o C and 50% humidity, before painting.

Waterblasting may also be carried out to remove unsound paint or substrate, however

NB: that is additional to waterblasting that must be undertaken following both Degrease

& Acid Wash.

If removal of unsound paint is required, it is recommended the surface be waterblasted

a second time, at least one hour after the first blasting, to ensure all unsound material

is removed.

If old paint is curling at edges after 1 hour, waterblast again. Repeat if necessary.

If this continues, you may need to sandblast to remove all paint.

3000 psi Robins (petrol driven) Water Blasters can be hired from most

Builders / Contrators Hire Equipment firms.