Many years ago I watched Edd China using a hand pump spray containing chemicals. The spray looked quite robust and I thought its got to be better than using the one I use on the roses.
It was if there is such a expression "workshop grade". I looked and found one with viton rubber seals. Similar to this
https://www.ebay.co.uk/itm/Sealey-S...952403&hash=item21322e8206:g:qskAAOSwXetZQQQK.
Rather a long paste and copy but Ive tried it and it works.
Its not the one I bought but its look identical. You can get a decent bit pressure into it and the nozzle spray fitting was excellent. No comparison to my rose spray. So when required heat up the ACF50 and apply. The bottle will retain its pressure for weeks. The seals are good.
It will never beat a compressor but it does for me.