Use a Kitchen Rolling Pin: If you don’t have a silicone craft roller, you can use a kitchen rolling pin to flatten the diamond painting. Cover the painting with an old tee-shirt or a large soft cloth before rolling it with a rolling pin to protect the drills from cracking or tarnishing.

Clean the Painting With a Hairdryer: Before applying the sealant, use a hairdryer on the lowest power and temperature settings to blow cool air over the painting, removing any dust particles trapped in the gaps and grooves.

Use a Good-Quality Paintbrush: Cheap paintbrushes often lose a few hairs, which stick to the painting during the sealing process. Sometimes these hairs are only noticeable once the sealant has dried, at which point it’s impossible to remove them. A good-quality paintbrush solves this problem.

Apply Brush-On Sealant Sparingly: Using too much sealant results in a thick coating that’s often uneven and doesn’t dry and harden fully. Apply a little sealant at a time and brush it out thinly to give the painting a shiny finish.

Add Mod Podge Glitter Sealant: For extra shine and sparkle, use Mod Podge glitter sealant. Use regular Mod Podge on most areas, and add the glitter variation of this sealant to one or two sections to add nuance.

Speed Up the Drying Process: Place a fan 4–6 feet away from the painting to dry the sealant faster.