Mix fresh Arathane 5750 A/B (LV) per instructions and apply to repair area with

a clean, dry, acid brush or equivalent, making sure that fresh coating overlaps

the intact coating. The repaired board may be put back into service after a 4

hour cure at 100oC (or alternative cure schedule).

Note: This procedure is not advised for other than field or temporary repair.

Using a sharp knife to scrape the coating may also cause damage to the

printed circuit board, circuitry, or other components.

The cured coating may be burned through directly with a soldering iron if only

the solder joints are involved. Any coating on the leads may be easily sliced

with a razor knife to facilitate part removal. Remove the burned residue and

sand smooth rough burned edges of intact coating. Wipe away debris and

solder new part in place. Remove dirt/resin flux with clean cloth dipped in

isopropyl alcohol. Dry for 30 minutes at 65–80oC before recoating. Mix fresh

Arathane 5750 A/B (LV) and apply a thin coat over repair area. Make sure to

overlap original coating. Cure 4 hours at 100oC (or see alternative cure

schedules).

Note: Toxic gases from burning cured urethane systems may be evolved.

Perform this procedure only in well-ventilated areas.

Chemical removal Use our Arathane 5750 Stripper for selective or total removal of cured

compound.

Important: Laboratory tests indicate that if suggested procedures are

followed, there will be little or no adverse effects to the printed circuit board or

components. However, since each application is different, users should test a

representative board that has been coated and fully cured to determine

deleterious effects of stripper.

Localized chemical

removal

Prepare printed circuit board by masking off area to remain intact. If possible,

dam up repair area beyond component level to prevent 5750 Stripper from

spreading to unwanted areas.

Using an acid brush, apply generous amounts of 5750 Stripper over

components in repair area. Do not allow to dry. Keep applying stripper until

coating starts to swell and flake off (approximately 5–10 minutes). While

keeping repair area saturated, periodically brush away loosened coating. If

necessary, a blunt tool may be used to remove thick sections of coating. After

20 minutes exposure to stripper, drain board and allow to dry. Scrape away

any loose coating close to or under components. If further cleaning is

necessary, apply fresh stripper and repeat process for an additional 15

minutes.

Follow same procedure for underside of board. Remove masking/damning

materials and replace defective parts. When removing part, scrape away any

coating remaining beneath it prior to replacing. Remove flux and wash area

with deionized water. Dry with isopropyl alcohol and dry board 2 hours at 80oC.

Apply fresh Arathane 5750 A/B (LV) and follow recommended cure schedules.

Total coating removal Place board into a container of 5750 Stripper. Agitation will increase stripper

efficiency. For safety reasons, use 5750 Stripper at room temperature.

(Heating up to 50oC in a laboratory hood environment will reduce time to

remove coating.) Leave board in 5750 Stripper bath for 15 minutes. The

coating will swell and start to fall off the board. Brush board with stiff brush

periodically while in bath. Remove and inspect board and brush or scrape

away any remaining coating. For excessively thick areas, an additional