Irwin Tools Strait-Line 64901 Chalk Refills

Great item at an awesome price. Works as intended. I don’t need it to be permanent but it lasts long enough for its intended use. I recommend using this product.

I use this to tint drywall mud and it works extremely well. A little goes a long way when mixing into drywall mud. My advice is to add slowly while mixing. This product doesn’t require you to add more water to your mud. This chalk will not affect your mud’s ability to stick. For all purpose mud, this is a great addition to help when doing a second round for skim coating. Most PVA primers will hide the blue color in one coat as long as you keep it a lighter blue.

BEST chalk quality never clumps! Priced VERY reasonable too

I like the blue chalk best because it marks well on both light and dark surfaces. It's also easier to wash off than say, the red stuff. It does leak a bit while pulling out and placing the line. It is very fine. I do like the lid which makes filling up via the narrow openings of most chalk lines easy without spilling. I gave it 4 stars because it works well and does it's job, but at an acceptable level, not extraordinary. In the included photos I showed how I used it to mark out a solar panel rack installation on a metal roof.

I don't know about the variety of colors they offer I just got the blue and it worked fine from my project

Works as it should. Color red

Perfect product. Right color. Wrong level. Product images show the first picture a Level 4. That’s what I ordered. I received all Level 1. No time to ship back and wait. Won’t order again.

Works as expected