q a_0003.pdf

Response to questions received via e-mail on 14 August 2020 referencing project Bodie Island Lighthouse- Paint Gallery Deck

Questions are copied and pasted from the e-mail. Answers are provided in Blue font and italicized below each question.

1. The SOW refers to preparation and coating of masonry surfaces. There IS masonry work on the interior of the watch room, but the SOW appears to cover only exterior refinishing of metalwork. Please clarify.

ANSWER: This project includes only the exterior portion of the lighthouse gallery deck.

2. The SOW specifies zinc rich primer meeting SSPC 20 or 29 for metal surfaces:

In order to comply with the SSPC requirements and the primer manufacturer's specifications, the surfaces to be primed must be cleaned to bare metal per SSPC 10 (see the attached SSPC 10 doc., and Simco's product data for SSPC 20 zinc rich primer).

Although the spot rusted areas of the gallery, etc., are quite limited in overall size and location, the oxidation is significantly advanced, and cannot be properly prepared to receive new coatings without abrasive blasting. However, the current SOW does not permit abrasive blasting. We suggest that the SOW be amended to permit abrasive spot blasting, specifically limited to these oxidized areas.

ANSWER: Although there are several ways to complete surface preparation and cleaning, the National Park Service has deemed abrasive blasting/sand blasting to be one of the ways we do NOT accept for this historic structure. Hand preparation or sanding with cloth, paper, solvents, brushes, etc., or hand held tools will be able to reach the surface preparation requirements.

3. In order to determine the appropriate intermediate and finish coatings required, we request that the coating specifications for the prior restoration project, as well as any touch-up coatings used on the gallery be provided.

ANSWER: The coating materials used during the recent (2011-2013) restoration project are attached.

Bodie Island Lighthouse Paint Schedule

Exterior-

Metals

Galvinized Metals

Primer- COROTHANE GALVAPAC 2K ZINC PRIMER for onsite priming Sherwin williams

Shop primer- Macropoxy 646 Fast Cure Epoxy Part AB Sherwin williams

Mid Coat Macropoxy 646 Fast Cure Epoxy Part AB Sherwin williams

Finish Coat- Acrolon 218 HS Polyurethane Gloss Part AB Black Sherwin williams

Ferrous Metals-

Primer- Macropoxy 920 PrePrime Penetrating Epoxy Part AB Sherwin williams

Mid Coat- Macropoxy 646 Fast Cure Epoxy Part AB Sherwin williams

Finish Coat- Acrolon 218 HS Polyurethane Gloss Part AB Black Sherwin williams

Brick-

1st Coat- Coronado Lead Block Thin Film Encapsulating Coating Virginia Paint

Mid Coat- A-100 Acrylic Latex Satin Sherwin williams

Finish Coat-A-100 Acrylic Latex Satin White Sherwin williams

Wood-

Primer- A-100 Exterior Wood Primer B-42 Series Sherwin williams

1st coat- SWP Exterior Gloss Oil Base Paint A-2 Series Sherwin williams

2nd coat- SWP Exterior Gloss Oil Base Paint A-2 Series White Sherwin williams

Conduit-

Primer- DIM Was Primer Sherwin williams

1st coat Acrolon 218 HS Polyurethane Gloss Part AB WI White Sherwin williams

2nd coat-Acrolon 218 HS Polyurethane Gloss Part AB White Sherwin williams

Brass-

Primer- DIM Wash Primer Sherwin williams

1st Coat- Macropoxy 646 Fast Cure Epoxy Part AB Sherwin williams

Finish Coat- Acrolone 218 HS Polyurethane Gloss Part AB Black Sherwin williams

Windows-

1st Coat- Corothane Aliphatic Finish Coat Black/White Sherwin Williams

2nd Coat- Corothane Aliphatic Finish Coat Black/White Sherwin Williams

Pre wash for Metals Hold Tight 102 Solution Sherwin williams

Welds Touch up- Zinc Clad Organic Zinc-Rich Primer Sherwin williams

Rust Stains on Brick- PrepRite ProBlock Exterior Latex Primer Sealer Sherwin williams

Metal Fame Behind Rolled Roof Cornice- DTM Wash Primer Sherwin williams

1st coat 646 Macropoxy Black Sherwin williams

2nd coat -646 Macropoxy Black Sherwin williams

INTERIOR

METALS-

Primer- Macropoxy 920 PrePrime Sherwin williams

1st Coat- Macropoxy 646 Fast Cure Epoxy Sherwin williams

Finish Coat- Acrolon 218 HS Polyurethane Gloss Part AB Black Sherwin williams

Wood-

White

Primer S-W Prep-Rite Wall Wood Primer/Undercoater B-49 Series Sherwin williams

1st Coat- ProMar 200 Interior Alkyd Semi-Gloss Enamel B-34 Series Sherwin williams

2nd Coat- ProMar 200 Interior Alkyd Semi-Gloss Enamel B-34 Series Sherwin williams

Brick- Lime Paint Virginia Lime Works White

Conduit-

Primer- Sher-Cryl HPA Sherwin williams

1st coat- Lime Paint Virginia Lime Works White

2nd coat- Lime Paint Virginia Lime Works White

Cast Aluminum Fixtures-

Primer- DTM Wash Primer

1st coat- Lime Paint Virginia Lime Works White

2nd Coat- Lime Paint Virginia Lime Works White

Marble Floor

Cleaner- Stand Off Oil Grease Stain Remover

Sealer- ZEP High Traffic Floor Sealer Clear

Windows

1st Coat- Corothane Aliphatic Finish Coat Black/White Sherwin Williams

2nd Coat- Corothane Aliphatic Finish Coat Black/White Sherwin Williams