WEST SYSTEM 422 Barrier Coat Additive / blistering protection

10 in stock
SVB price: €21.81 (€43.61 / kg )
Excl. VAT, excl. shipping costs.
This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
€21.81 This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
Item no.
Model no.
WEST SYSTEM - 422 Barrier Coat Additive

Product details

Aluminium-based filler, designed to improve WEST SYSTEM epoxy resin's moisture exclusion effectiveness further and prevent gel-coat blisters (osmosis). 422 Barrier Coat Additive is ideal for creating a barrier coating that increases abrasion resistance. The filler can be added in weight-percentages from 20 to 25 percent to the epoxy resin mix.

The main purpose of this barrier coat additive is to create a sufficiently thick layer of epoxy resin that is abrasion and moisture resistant and prevents gelcoat blistering. It serves as an effective basis for subsequent surface treatment. It is recommended to apply at least two coats of epoxy resin as an effective moisture barrier. Three coats if you need to sand again. Each additional layer improves the water moisture resistance. For osmosis repairs and protection, a total of six coats with a thickness of at least 0.6 mm should be applied. The first coat without additives, the other five including the 422 barrier filler. This ensures maximum moisture exclusion effectiveness.


en-flag Safety datasheet
PDF, 156,16 KB
de-flag Safety datasheet
PDF, 241,93 KB

What other SVB customers have to say

100% real reviews

3 customer reviews

4.3 (out of 3 ratings)
3 Stars
2 Stars
1 Stars
Babett K.
by Babett K. Flag of Germany 4/14/2017 Verified purchase
Super product fast delivery
Georg A.
by Georg A. Flag of Spain 5/20/2017
Great filler
Stills well, 15% -20% with a std epoxy resin and as a "scrim" on a nonwoven fabric (M524 ECR 30A - Owens Corning - as it is used in GRP pressure tubes, ie desalting) applied, it forms a layer thickness of 0.8mm - easy to sand and has the osmosis prevention required layer thickness in one operation. Should revisit the common methods for osmosis protection ....
Georg A.
by Georg A. Flag of Spain 9/16/2016 Verified purchase
Good processability. 10-15% bW (by weight) are enough to make it much worse to grind. Whether or not the blocking effect propagated by West System is ... difficult to say, since there was nothing quick to find in the technical literature. UV light is withheld with certainty, so what pretty much destroys epoxy resins.

Rate product

How would you rate this product?
Completely fails to meet my expectations
Only some expectations are met
Meets my basic expectations
Slightly better than my general expectations
Fully exceeds my expectations
Click on the stars to rate

Customers ask customers

Ask other SVB customers who have already purchased this product from us about their experience.

Your question will be automatically forwarded to other SVB customers and published on the product page. Please do not ask any questions which can only be answered by the SVB team – such as the status of an order or product availability. You are also more than welcome to contact our SVB team by email at: info@svb24.com or by phone on: +49 (0)421 57290510 .

No questions asked yet. Be the first to ask a question!