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Are you using the official Bonty tubeless valve with the woefully-inadequate O-ring seal? If so, bin it, and use a standard tubeless value. The rim strip idea is a good one, the use of a waffer-thin O-ring to seal the valve is a crap one. The Hope tubeless valves work well with Bonty rim strips in my experience.
Leaving sealant to work past the valve is a bad idea, I've found. I've had a couple of alloy nipples give up the ghost due to corrosion from the ammonia-laden sealent.
Brommers
@M_V
Picked up a cheap Bonty TLR rimmed wheel today. Could hear some cack rattling around inside the rim cavity as I was checking it on the truing stand so pulled the rim tape off and opened up a can of worms I wish I'd let be.
The plastic rim tape I think was stuck to the rim with a lovely mix of sealant and aluminium oxide.
I did my best to clean the rim up, got rid of most of the oxidisation and most of the old dried up sealant but I couldn't get it set back up tubeless.
The plastic rim tape was rather misshapen from pulling it off so I tried with Tessa tape instead. 2 wraps first then 4. Seating both beads with a tube then pulling the tube out didn't work as the 2nd bead just de-seated itself.
Untaped it and put the plastic rim strip back in the and tyre would seat more easily and the 2nd bead stayed on when pulling the tube out but there was a lot of air leaking out around the valve and spokes when I aired it up without any sealant in. I then tried one wrap of Tessa under the rim strip but it wasn't much better.
Not sure whether buying and fitting a new TLR rim strip will seal it up given that the rim bed isn't in the best shape. Or is it likely that if I chuck sealant in it'll fill the holes around the valve and where ever it's getting to the spokes from?