Step 1: Mask off any areas on your 3D item that you do not wanted painted with the masking tape.  The entire item will be dipped so make sure any part of the item that you do not want covered in paint is masked off with the tape.

Step 2: Paint your 3D item that you plan to hydro dip with a primer of your choice.  We used a white spray paint primer on our items.  We used 2 coats to make sure that it's fully covered.  Allow this paint to dry completely (probably will take 2-3 hours).

Step 3: In a large plastic bin or bucket, fill 3/4 of the way to the top with warm water.  We used plastic bins that we found at the our local dollar store.  You will want to ensure that your bin is wide enough to hold the item that you will be dipping.

Step 4: Choose the colors of the spray paint that you want for your item.  Spray the paint on the top of the water and use a stick to slowly swirl the colors together to get the design that you prefer.

You can also spray multiple areas and use the different colors to get the marbled affect that you like.

Step 5: Then dip your item slowly into the water and paint mixture. We chose the area we liked based on the design on top of the water in that area.

You will want to completely dip the item into the water very slowly and then pull it straight up so it does not get additional paint on when it's removed.  Allow the item to completely dry.

Step 6: Then apply a top coat to seal the paint onto the item.  Also allow this coat to dry completely.