Spot Paint Maintenance (final)

Ongoing maintenance treatments.
johnleeke
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Full Name: John Leeke
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Spot Paint Maintenance (final)

Postby johnleeke » March 10th, 2013, 5:09 pm

WPSC Window Standard Work Method

Status: [ ] submitted work method, [ ] proposed treatment standard, [x] final treatment standard
Update: 3/10/13
Author: John Leeke
References: Historic HomeWorks website, discussion forum, http://historichomeworks.com/forum/viewtopic.php?t=1810 (Accessed on 1/1/2013.)
Contributors:

Title of Treatment: Spot Paint Maintenance
Class of Treatment: [x] Maintain, [ ] Stabilize, [ ] Repair, [ ] Upgrade, [ ] Exception
Type of Treatment: [x] Traditional, [x] Contemporary, [x] Conservation

Condition to be Treated: Paint failure in tightly localized spots.

Description: Remove damaged paint, seal loose or open joints and paint. This treatment is suitable for interior and exterior areas of peeling or missing paint. Moisture causes paint to peel. Typical sources are exterior rainwater on the glass above, interior condensation on the glass above and water on the sill. Spot paint maintenance will help seal out the water, keeping the wood dry. Several spots on more that one window can be treated at the same time, achieving an efficiency of scale.

Typical Procedure:

1. Set up for lead-safe operations, which may include working wet during paint removal, surface preparation and clean up.

2. Assess conditions, determine causes, plan work. The paint film may be cracked, alligatored, loose, peeling or missing. Determine the extent of the damage.

3. Hold the sash steady with wedges between an edge of the sash and the jamb of the sash track.

4. Scrape off loose paint with steel scraper. Clean out open joints, especially along the glass.

5. Final lead-safe cleanup, then let the wood dry out. This might take a full day, or use fan, hair dryer or hot air gun to speed up the drying.

6. Pre-treat with oil on all bare wood, soaking more oil into the joints. Let dry for a day. Skip this step if using sealants in joints for step 7.

7. Fill open joints with oil-based putty. Skip this step if using sealants.

8. Prime bare wood surfaces, lapping 1/16" onto glass and lapping just a bit (1/8") onto edge of sound paint. If using sealants work primer into loose or open joints, clean any free liquid primer out of the joints by wiping with thin cardboard. Allow primer to dry.

9. Seal joints between wood parts and between wood parts and glass pane. Allow sealant to cure.

10. Sand lightly, if primer feels rough.

11. Paint, two coats, with topcoat paint, lapping 1/16" onto glass. Allow to dry between coats. Sand lightly after first coat if surface feels rough.

12. Remove wedges. Make sure sash moves freely and is not painted shut.

Materials:
· Sandpaper, 100 grit
· Putty, glazing compound or sealant
· Oil-based pre-treatment
· Primer, oil-based
· Paint, top coat, oil-based or waterborne acrylic

Quality of Results:

Best Work: Open joints are filled. Paint coating presents a smooth surface and even luster. Paint and primer lap onto glass. Sash moves smoothly.

Inadequate Work: Remaining loose or peeling paint. Paint feels rough or appears uneven. Open joints that are not filled. Sash is painted shut or does not move smoothly.
Attachments
SashPaintSpotA.JPG
Paint at sash joint missing, peeling and alligatored.
SashPaintSpotB.JPG
Scraping loose paint with steel scraper.
SashPaintSpotC.JPG
Priming bare wood surfaces.

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