KwikWood
This is the best putty we have found for repairing linoleum and wood blocks.
KwikWood is strong, fast-setting, hand-mixable, NON-SHRINKING epoxy putty. It feels like modeling clay and looks like a tootsie roll, with the base material wrapped around the curing agent. After it has cured, it is very similar to wood in hardness and density. KwikWood can be carved just like wood and it accepts ink very well.
Just cut or twist off a small amount, mix well and press it into the area you want to repair. Wait about an hour, then sand and carve. When you are ready to print, charge the block with two or three proof prints. After that, you will not see the repair because unlike regular wood putty, which contracts as it dries, KwikWood does not shrink. We recommend experimenting with KwikWood on a scrap of wood before using it on a block you plan to print.
Because it is epoxy, wear gloves when you are handling KwikWood and a mask when you are sanding it. MSDS (Material Safety Data Sheet) available upon request. KwikWood has a shelf life of two years if it is kept at room temperature in its original package.
If you are looking for QuikWood, it has been discontinued. However, as far as we can tell, KwikWood is identical in how it performs.