For a 1.1 silpoly pu400 tarp, which side should be out?

**Lenaxia** · 12-09-2016, 01:37

I'm about to make a tarp and I've been trying to figure out which side should be out. Someone mentioned in passing that with pu4000 it doesn't matter which side was out but I haven't been able to find any secondary confirmation. Can someone confirm?

Thanks,
Mike

**captainhaddock** · 12-09-2016, 05:50

My pu4000 has one shiny side and one matte side.

I don't think it matters for more than aesthetics really, but I have the matte side as the outside.

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**willys05tj** · 12-09-2016, 07:06

I believe according to RSBTR in their FAQ section, it states matte side out shiny side in.

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**Lenaxia** · 12-09-2016, 10:52

Originally Posted by willys05tj

I believe according to RSBTR in their FAQ section, it states matte side out shiny side in.

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Thanks, didn't realize they had an FAQ. I found it.

Is there a right and wrong side to your coated fabrics? (e.g. Silnylon)*
This depends on the particular fabric, but if there are distinct sides, this will be noted on the product page for that fabric.

For example, our PU4000 fabrics (e.g. 1.1 oz Silpoly PU4000) have a PU coating on one side and DWR (Durable Water Repellent) finish on the other. For these fabrics, it is recommended to put the DWR finish out towards the elements and the PU side inwards.