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I probably would not recomend it. A laminate floor is a floating floor and the flex, expansion and contraction of both as well as the hollow sound you can have with a laminate may give you undesireable results. Laminates come out very easily and I feel it worth your while to remove the 1st laminate to elimate any future floor structural issues and install the new floor to the manufacturer's specifications.
It sounds like the existing laminate flooring is solid and free from flex. If so, you will have no problem installing the new laminte over the old. You will want to use a sound absorbing pad underneath to avoid a hollow sound as well as potential squeeks between the 2 laminate surfaces. Best of luck!
D.R. Domenichini Coosntruction
Start with a washcloth and some rubbing alcohol and gently wipe down where the scratches are. Take a cotton swab and go through each scratch with some rubbing alcohol to make sure they are cleaned out. Purchase a floor repair wax kit from your local hardware store (I recommend Picobello Flooring Repair Kit). Using the putty knife, apply wax to scratches and ensure its all the way inside the cracks. Once you are done, take the flat edge of knife and scrape off any excess wax. Last step just gently wipe repaired areas with a cloth to wipe up any residual wax.
For cleaning the floors, make sure you are using a damp (not soaking) mop with a small ammount of floor cleaner.
Hope that helps!
Ailwood Scratch Cover is a coating that masks dents and scratches. Start with that. Apply per instructions. Comes in three colors. Available at most fine paint stores. Cleaning engineered floors is easy. Just use a mild cleaner and a damp mop.
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