This may have been covered before but I just converted my wire wheels to tubeless. I used technique referred to in one of many videos on the web. I used a marine sealant from 3m to plug all the spoke holes followed by a special tape also by 3m. If you search the web, you will find the video which gives specifics on the 3 m products. It takes some time but is not difficult and so far results have been fine with no significant pressure loss over a couple of wks. I think cost was less than $30 (sealant, tape and valve stems). The convenience and safety of tubeless was to much to pass up.