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Finish induced warping

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Forum topic by GuntherBespoke posted 08-23-2017 02:41 PM 286 views 0 times favorited 5 replies Add to Favorites Watch
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GuntherBespoke

2 posts in 30 days


08-23-2017 02:41 PM

Had a very peculiar experience yesterday. My pine panel was flat and sanded but cupped at least 1/4” across 24” once I hit it with my water based dye (transtint in water).

The grain had already been raised, and I’m wondering if it was simply too much water for the panel to handle.

I chose not to panic, and continued the finishing. 1 coat of an amber dye followed by a walnut custom blend once dried. Then 3 coats of GF Enduro water based, sprayed through hvlp.

Flipped it over, same process on the other side. I come back to the shop this morning and it has flattened back out.

Is this usual? It is the first time it has happened to me.


5 replies so far

View Madmark2's profile

Madmark2

336 posts in 342 days


#1 posted 08-23-2017 03:03 PM

Yes, this is why most suggest finishing both sides at once.

M

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splintergroup

1488 posts in 976 days


#2 posted 08-23-2017 03:04 PM

Very common! Partly the reason I try to avoid water based dyes and instead use alcohol based.

View gargey's profile

gargey

794 posts in 529 days


#3 posted 08-23-2017 03:29 PM

It seems to be the opposite of peculiar to me. Wood expands with humidity, and expands that much more when soaked…

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GuntherBespoke

2 posts in 30 days


#4 posted 08-23-2017 03:33 PM

I suppose it has always happened, I only just noticed it this time.

I honestly thought the water would evaporate before a substantial amount would soak sufficiently deep into the wood.

I’ll experiment with using alcohol as the medium for the dye concentrate.

Thanks all.

View CharlesNeil's profile

CharlesNeil

2013 posts in 3624 days


#5 posted 08-23-2017 03:41 PM

Alcohol or water can both swell wood, alcohol dries faster so its lees prone, however doing both sides as quick as possible is the best preventive ..and be sure both sides are getting air flow, meaning dont lay it down on a table or bench .. either stand or support so both sides equally.
If it does start to cup turn the concave side DOWN and convex up .. will usually balance out

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