How many folks reuse their dinette cushion foam?

 I reused the foam on our Compact  and it worked out fine. Although the original foam was a little thin. I like 6" foam better. 

 Is your old foam comfortable enough to sit on for long periods of time? That's the real question. 

Not sure he is talking about the spring cushions. If so mine did not originally have any foam. Only a mat of strange looking stuff but in good shape, batting, muslin and batting. I threw out the batting and used a 2" pc. of foam and new batting. Much softer but not too tall for the dinette.

 I remade the table leg to raise it 1 1/2" which worked perfectly. I thought 4 inch foam was a little rough to sit on for more than 20 or 30 minutes at a time. Pillows also help eliminate the 90 degree angle effect.

If your foam is in decent shape and you can't squeeze it all the way together with your fingers, then it's perfectly fine to use. You can always beef it up with another thin layer. I used 4" foam with a 2" memory foam topper. It makes for a very comfy sleeper. Also, wrap your foam in batting.

I don't have an issue with my knees hitting the table, I'm just thankful my feet touch the floor, but it did raise the back cushion to the very bottom of my window. Any thicker and my back cushion would have been above my window. Make sure you get your cushion cover to fit very snugly. The foam topper squishes in the tight cover and makes a very smooth looking surface but still conforms when you sit or lay on it.

I've read the vodka wash idea for sanitizing and have given that some thought. I'm sure that drenching foam in alcohol is such a good idea; would it cause the foam to deteriorate faster? Not sure. You can wash it, just make sure you wring it out well and let it dry thoroughly. But unless it is really disgusting, in which case just through it away, it is going to be "sealed" in the batting and cover.

Priceless!