English (United Kingdom) - Paul Wurth

Application Instructions
Application Instructions
For product description refer to product data sheet
Issued: March 2010 Page 1 of 4
HEMPEL’S VINYL ESTER GF 35910
HARDENER 99410
Scope: These Application Instructions cover surface preparation, application equipment, and
application details for HEMPEL’S VINYL ESTER GF 35910.
Surface preparation: New steel: Remove oil and grease, etc. with suitable detergent. Remove salt and other
contaminants by (high pressure) fresh water cleaning. Abrasive blasting to Sa 2½.
Minimum surface profile corresponding to Rugotest No. 3, BN11, Keane-Tator
Comparator, 5.5 G/S, or ISO Comparator Coarse (G). After blasting, clean the surface
carefully from abrasives and dust.
On pit-corroded surfaces, excessive amounts of salt residues may call for dry abrasive
blasting, high pressure fresh water hosing, drying, and finally, dry abrasive blasting
again as described above.
Galvanized, Zinc primed steel etc.: Metallic zinc inhibits the curing process - the
product is not compatible with galvanized steel or other zinc coated substrates. Steel
primed with zinc dust containing pre-fabrication primers must be re-blasted to min. Sa
2½-3 to remove all traces of zinc.
Application equipment: HEMPEL’S VINYL ESTER GF 35910, being a high-viscosity material, requires special
measures to be taken at application.
Standard airless heavy-duty spray equipment:
Pump ratio: min 60:1 (See Note below)
Pump output: min. 12 litres/minute (theoretical)
Input pressure: min. 6 bar/90 psi
Spray hoses: max. 50 metres/150 feet, 3/8" internal diameter, nylon lined
max. 3 metres/10 feet, 1/4" internal diameter
Regular surfaces:
Nozzle size: .030" through .060"
reversible tip
Fan angle: 40-60°
Filter: Surge tank filter and tip filter should be removed.
Note: Avoid the use of a suction hose. Use an interchangeable pipe, which makes it
possible to remove cured paint.
The pump should preferably be fitted with leather seals although Teflon (PTFE) seals are
acceptable for small jobs.
Pump ratio 60:1 is recommended, however, if only 45:1 is available, it is recommended
to shorten the hoses to 15 metres/50 feet hose (Min. ½” internal diameter)Before
application starts, the filter should be removed and hoses should be washed with
styrene.
Thinning: Do not thin. Alternatively max. 5% styrene may be added, but this must be done with
care as the anti-sagging properties are drastically reduced and chemical resistance may
be affected.
Airless spray data are indicative and subject to adjustment.
HEMPEL
Application Instructions