Cresting practice and final finish weight check

What you’ll do #

Apply a simple crest pattern to two or three of your sealed shafts (the rest of the batch can receive the same pattern once you have practiced), then weigh all 24 shafts after final finishing and verify that the batch is within the GPP tolerance for the 40 lb bow. By the end you will have: crested shafts that can be identified at a communal target, a weight log that confirms GPP for all 24 arrows, and a clear record of any outliers that need attention before fletching.

This exercise has two parts that you run in sequence: cresting practice (Part A), then weight check and GPP calculation (Part B).

Setup #

Tools and materials needed:

Part A (cresting):

• 2–3 sealed, fully cured shafts (do not crest until the dip coats are fully cured — crest paint on a tacky surface bleeds)
• Cresting jig or a simple improvised spinner (a drill press, a slow-speed rotisserie motor, or a V-notch in a block that lets you rotate the shaft manually)
• Acrylic craft paints (2–3 colors of your choice; artist-grade acrylics or lacquer-based cresting paint both work)
• Fine liner brush (size 0 or 00 for separator lines), medium flat brush (3/8" or 1/2" for base band), medium round brush (size 2 or 3 for accent bands)
• Clear topcoat (your dip sealer , or a spray lacquer for the crest zone only)
• Masking tape or a steady hand and a band-width gauge

Part B (weight check):

• Grain scale (the same scale used in exercise 1)
• Your bare shaft weight log from exercise 1
• Calculator or spreadsheet
• Component weight data: 100-grain field points, nock insert weight (check the package — typically 8–12 grains for standard plastic nocks), feather weight estimate (15–25 grains for 3× shield-cut turkey feathers — use the mid-estimate of 20 grains for this calculation; you will refine after fletching in module 4)

Part A — Cresting practice #

Scaffold #

A1 — Choose your color scheme #

Base color (widest band, 1–1.5 inches):  _______________________
Accent color (narrower band, 3/8–1/2 inch):  ____________________
Separator line color (thin lines, 1/16 inch):  __________________

Location on the shaft (measured from the nock valley):
  Base band starts at:  _______ inches from nock valley
  Base band ends at:    _______ inches from nock valley
  Accent band starts at: ______ inches from nock valley

[TODO: The crest sits between the nock valley and the start of the fletching. A standard placement for a 28-inch arrow with 5-inch feathers is: base band from 5.5 to 7 inches from the nock valley (1.5 inches wide), accent band from 7 to 7.375 inches (3/8 inch), separator lines at each transition. Adjust to your feather length and personal preference — the key is that the crest does not extend under the fletching adhesive zone.]

A2 — Apply the base band #

1. Mount the shaft in your cresting jig or improvised spinner.
2. Load your medium flat brush with the base color — not dripping, but fully loaded.
3. Hold the brush steady and rotate the shaft slowly (or use the jig’s motor). The paint should lay down in a smooth band in one or two rotations.
4. Let the base band dry to touch before proceeding. Acrylic craft paint: 15–30 minutes. Lacquer-based cresting paint: 5–10 minutes.

Base band result:
Width achieved (measure with a ruler):  _______ inches
Edge quality (sharp / slightly feathered / ragged):  _____________
Coverage (solid / thin/patchy):  ______________

[TODO: If the edge is ragged, you are either moving the brush during application (hold it completely still against the rotating shaft) or the paint is too thin. Thicken acrylic paint by leaving the brush loaded for 30 seconds before applying — the tip of the brush will carry slightly drier paint that cuts a cleaner edge.]

A3 — Apply the accent band #

Wait for the base band to be fully touch-dry. Then:

1. Load the medium round brush with the accent color.
2. Position the brush at the edge of the base band (or at your measured accent band start point).
3. Rotate and apply in 1–2 smooth passes.
4. Let dry to touch.

Accent band result:
Width achieved:  _______ inches (target: 3/8–1/2 inch)
Did the accent color bleed into the base color?  Yes / No
If yes — base color was: fully dry / still tacky when accent was applied

[TODO: Color bleeding at the band boundary is almost always caused by applying the next color before the previous one is touch-dry. This is the “hurry” failure mode described in the 3Rivers technique warning. The fix is patience, not a different paint. If it bled, wait the full dry time, sand very lightly with 400-grit to flatten the bleed zone, and re-apply.]

A4 — Apply separator lines (optional but recommended) #

Separator lines are the 1/16-inch lines painted at the transitions between bands. They cover the edge irregularity between colors and give the crest a finished, professional look.

1. Load the size-0 liner brush with your separator color (typically white, black, or a contrasting third color).
2. Hold the brush still; rotate the shaft.
3. A single rotation is usually enough — liner brushes are loaded with enough paint to cover the circumference in one pass if the bristles are fully wet.

Separator lines applied:  Yes / No / Skipped for practice
Quality:  Clean and consistent / Slightly wobbly / Ragged

A5 — Topcoat the crest zone #

Once all crest bands are fully cured (minimum 2 hours for acrylic, 1 hour for lacquer-based paint), apply one coat of clear topcoat over the crest zone.

Brush on lightly — a thin coat is enough. The goal is to seal the crest paint from abrasion, not to build additional film thickness.

Topcoat applied:  Yes / No
Topcoat type:  __________________________
Dry time before handling:  _______ hours

[TODO: Spray lacquer applied from a rattle can is convenient for the crest zone topcoat — one light pass from 10–12 inches covers the crest bands without drips. If you use brush-on topcoat, apply with a light touch and one direction — do not scrub back and forth across the crest, which lifts the paint underneath if it is not fully cured.]

Part B — Weight check and GPP calculation #

Scaffold #

B1 — Weigh all 24 sealed and crested shafts #

After the final coat (including crest topcoat if applied) is fully cured, weigh every shaft. Record next to the bare weight from exercise 1.

Shaft weight log — after finishing:
Shaft | Bare weight (gr) | Sealed weight (gr) | Finish added (gr)
------+------------------+--------------------+------------------
1     |                  |                    |
2     |                  |                    |
...
24    |                  |                    |

Finish weight added — batch statistics:
  Mean added:    _______ grains
  Maximum added: _______ grains (shaft #___)
  Minimum added: _______ grains (shaft #___)
  Range:         _______ grains

[TODO: A range of finish weight added greater than 5 grains across the batch is a flag — inspect the light-finish shafts for thin coating and the heavy ones for drip runs. Within 3 grains is excellent. Within 5 grains is good for a hand-dip operation.]

B2 — Calculate GPP for each shaft #

Use the formula from the concept page:

GPP = (shaft weight + point weight + nock weight + fletch weight) ÷ draw weight

Your draw weight: 40 lb

Component weights to plug in:
  100-grain glue-on field point:  100 grains (fixed)
  Plastic nock insert:            _______ grains (check your nock package)
  3× shield-cut feathers:        _______ grains (estimate; refine in module 4)

Example calculation for shaft #1:
  Sealed shaft weight:  _______ grains
  + Field point:        100 grains
  + Nock:              _______ grains
  + Fletching:         _______ grains
  = Total arrow weight: _______ grains

  GPP = _______ ÷ 40 = _______

Target range: 6.5–8.0 GPP for traditional target archery at 40 lb draw

[TODO: Calculate GPP for all 24 shafts. Note any shaft where GPP falls outside 6.5–8.0. For a cedar set, you are very likely to be in the 9–12 GPP range — cedar + 100-grain point is a heavier traditional setup, which is fine for a 40 lb target bow and foam/burlap targets. The calculation is still important: it tells you where you are relative to the recommended range and flags any shaft that is dramatically heavy.]

B3 — Identify outliers #

Shafts outside 6.5–8.0 GPP target:
  (These are informational — do not discard the shaft; note whether it is above or below)
  Shaft #___:  _______ GPP (above / below target)
  Shaft #___:  _______ GPP (above / below target)

Shafts more than 8 grains above the batch mean sealed weight:
  (Candidates for inspection — may have a finish buildup)
  Shaft #___: _______ gr above mean

Shafts more than 8 grains below the batch mean sealed weight:
  (Candidates for a light re-dip — may have gotten a thin coat)
  Shaft #___: _______ gr below mean

[TODO: For the 40 lb bow matched set, the practical GPP floor is “above 6.5” — no cedar arrow at 11/32" with 100-grain points will fall below that. The ceiling check (too heavy) matters more: an arrow above 15 GPP at 40 lb draw is very slow and may not group with the rest of the batch. Investigate any shaft above 12 GPP — it may have significantly more finish on it than the others.]

Verification #

Part A is complete when:

• At least 2–3 shafts have a crest you are happy with, with a clear topcoat applied and cured.
• The band sequence was applied in the correct order: base band first, accent band second, separator lines last.
• No color bleeding is visible at the band boundaries (or you have identified it as a curing-time issue and corrected it).

Part B is complete when:

• All 24 shafts have a sealed weight recorded.
• Finish weight added per shaft is calculated for all 24.
• GPP is calculated for all 24 using your component weight estimates.
• Outlier shafts (finish weight or GPP) are noted.

When both parts are complete, you have 24 sealed and optionally crested shafts with a documented finish weight and GPP. They are ready for module 4: fletching, nock inserts, and field point attachment.