Where to Start, Part 6, Choosing a Block

The last step was spreading filler. Now, it’s important to choose the correct sanding block.

True Blox are a different kind of block.  Almost all other sanding blocks in the past were basically the same, there were only a couple of them, and they were just different lengths.  They were very general purpose. 

•There are 9 different thicknesses, and 7 different lengths. What’s the point, and how do you choose which block to use? 

♦️Choosing a block is based mostly on how much it flexes, which is determined by the block’s thickness. 

♦️The longer a block is, the more flexible it will be. So a 12” long 3/8” thick block will be pretty rigid, while the same block 22” long will be a little flexible. 

♦️The correct block should take a small amount of tension to form to the shape of the panel. 

♦️The block should do most of the work sanding the correct shape, so choosing one too rigid or too flexible won’t work as well. 

♦️If the center of the block is doing most of the sanding, it’s too rigid.  

♦️If the block seems too loose and the ends are sanding too much, it’s too flexible. 

♦️Most times, several blocks are needed for one panel. It’s encouraged to switch blocks freely until one feels right. 

♦️Usually, the longer the block the better. It should not feel awkward though. It typically shouldn’t be longer than the panel is (the edges will get sanded too much)

♦️A bigger block does not mean straighter body work.  So don’t jump to grabbing the thickest and longest block thinking it will work better.

1 comment

  • Getting ready to order another set of pads from you guys. Just wondering which compound system you prefer with them that has yielded the best results for you? Thanks, and have a nice weekend!

    Kevin Barkwell

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