〈錆（び）／さび／サビ〉〈付／つ／ツ〉い

Google N-gram Corpus Counts
╭─ーーーー─┬────────┬───────╮
│ 錆び付い │ 24,834 │ 25.9% │
│ 錆びつい │ 19,472 │ 20.3% │
│ 錆付い　 │ 16,803 │ 17.5% │
│ さび付い │ 14,255 │ 14.9% │
│ 錆つい　 │  6,676 │  7.0% │
│ サビ付い │  1,112 │  1.2% │
│ さびつい │  7,095 │  7.4% │
│ サビつい │  5,720 │  6.0% │
╰─ーーーー─┴────────┴───────╯

@@ -5 +5 @@
-<keb>錆びつく</keb>
+<keb>錆び付く</keb>
@@ -8 +8 @@
-<keb>錆び付く</keb>
+<keb>錆びつく</keb>
@@ -20,0 +21,4 @@
+<k_ele>
+<keb>サビ付く</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
@@ -22,0 +27,4 @@
+</r_ele>
+<r_ele>
+<reb>サビつく</reb>
+<re_inf>&sk;</re_inf>

Google N-gram Corpus Counts
╭─ーーーー─┬───────┬───────╮
│ 錆びつく │ 1,402 │ 26.3% │ (meikyo)
│ 錆び付く │ 1,192 │ 22.4% │ (most kokugos)
│ 錆付く　 │ 1,109 │ 20.8% │ (many kokugos, gg5)
│ さび付く │   614 │ 11.5% │ add sK (jitenon, shinkoku)
│ 錆つく　 │   555 │ 10.4% │ add sK
│ さびつく │   453 │  8.5% │
╰─ーーーー─┴───────┴───────╯

@@ -14,0 +15 @@
+<ke_inf>&sK;</ke_inf>
@@ -17,0 +19 @@
+<ke_inf>&sK;</ke_inf>

gg5, prog
daijs: 金物がさびて他の物に付着し、離れなくなる。また、金物がすっかりさびる。「ねじが―・いて回らない」

Splitting sense 1 into two senses.
The fig tag isn't necessary here. It should only be used when literal and figurative glosses appear in the same sense (which isn't very often).

@@ -25,3 +25,2 @@
-<gloss>to rust together</gloss>
-<gloss>to be rust-covered</gloss>
-<gloss>to be rust-eaten</gloss>
+<gloss>to become rusted together</gloss>
+<gloss>to become rusted shut</gloss>
@@ -32,2 +31,9 @@
-<gloss g_type="fig">to lose one's skill</gloss>
-<gloss g_type="fig">to become rusty</gloss>
+<gloss>to rust</gloss>
+<gloss>to become (completely) rusty</gloss>
+<gloss>to be covered with rust</gloss>
+</sense>
+<sense>
+<pos>&v5k;</pos>
+<pos>&vi;</pos>
+<gloss>to become rusty (of a skill or ability)</gloss>
+<gloss>to become less effective</gloss>

Not at present. Needs thought.