I conducted a second test with wood dye after reading a post by badcrayon suggesting using Sanding Sealer to assist in masking the dye area.
Here are the results I obtained.
Picture No 1: The product used and the test Sample
Picture No 2: Sanding sealer applied below the first tape
Picture No 3: The first tape relocated to the top of the sealer edge
Picture No 4: A second tape applied to bare timber above the test area.
Picture No 5: The dye applied with a pad/wad.
Picture No 6: The results with both tapes removed from the test area.
Looks like the application of sanding sealer in conjunction with Painters Tape is effective in preventing weeping and produces a far better result than any painters tape used on its own from the stocks I have used.
-- Regards Robert