Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: need replacement blades
Document: You'll need to practice some if your new at using one of these. It works great for what I needed it for.
Everything works as advertised . 4 inch blade need s to be heavier as it bends easily when hot but can be worked just slower.
The indicator light wouldn't even go on. I tried taking the blades on and off three times (even trying the other blade) thinking I might be doing something wrong but it became obvious that this knife was completely defective and nothing more than a $170 paperweight.I contacted the company's customer service and it took two days for them to respond.
This hot knife makes sculpting Styrofoam stage props a breeze. No more mess from conventional methods of cutting and shaping Styrofoam, this knife should be in the tool arsenal of every prop builder and set designer. Easy to handle, heats evenly and cuts Styrofoam as if it was butter, and best of all you can purchase a multitude of different blades or make your own. Demand Products offers every type of foam cutter there is, from craft-quality to professional production.
Loved it! Wish I'd discovered this product years ago. I use the hot knife for cutting 4'x8' sheets of styrofoam insulation (1" thick) to make mural backdrops. After I received the hot knife and read the directions I ordered 2 inch blades before using it because it was recommended not to use a blade that is too long so the blades will not overheat (I wish I had known that beforehand). Great product!
I purchased this hot knife to finish a crafting project that I'm trying to get done by the end of the month. This item was shipped to me in small box which just had the case holding the knife/blades/etc. There was no tape or anything like that on the case which made me wonder if this item had been opened before. The knife and other components were loose inside the case which seemed rather poor on the manufacturer's part. After easily assembling the blades and turning the knife on nothing happened.
I was using and box cutter and hack saw blade prior to this unit. This works extremely well cutting 4 and 8 lb foam 3&#34; thick very well. If you take your time, correctly dial in the heat and clean your blades after use this unit will last a long time and make perfect perpendicular cuts to the surface very well. cutting circles is a bit more complicated due to the wide blade but can be done efficiently and cleanly if you take your time.
Works reasonably well, but does take 10 to 15 seconds to heat up. Thumb heat control should be labeled better so you know which way to turn it for more heat. Wish it had a lighter more flexible cord so you don't have to wrestle with it. Does seem to be of decent quality otherwise.
We needed to cut out several 10 foot tall foam horses for a Halloween Parade float. We drew out the designs and were told to use this particular brand of hot knife. WOW, it cut through the styrofoam SO effortlessly and our horses came out looking PERFECT. It literally cut through the foam like a hot knife through butter.Worth EVERY PENNY. We're going to use this in future years to cut out decorations for other holidays. SO GLAD IT WAS RECOMMENDED.
Using it for cut to fit 1 1/2" foamular sheathing to replace fiberglass in Joist pockets (Sill boxes)of a basement. On thinner material I guess you would have to pulse the trigger but not for thethicker stuff.Has cut very well consistently. Although it is rated as a craft knife, it's really professional quality.
Answer: yes