Do I need a respirator?

If you are using an aerosol spray paint you should always use one.

Always read the manufacturer’s instructions/advice on the back of can. Even if you are spraying out side you should wear a respirator.

I would also wear one for applying grass scatter and static grass as the small particles of grass are easily inhaled and hang in the air.

Don’t take it off until you have left the area where you have been working.

I wear one whenever using solvent based products and when making up plaster/ sculpting plaster or grinding resin products.

Basically, if it can be inhaled and its not fresh air you should wear one.