Priming MDF Edges

mpt1123

Hello:
We're re-building a set of stairs and planning to use MDF for the risers. The stairs are boxed on the sides so the MDF edges won't show. Nonetheless, I want to seal them before priming and painting. I see a lot of mention on the internet about applying a thinned carpenters glue solution to the edging first, followed by a good oil based primer. I'm hesitant to use anything water based around MDF - including a thinned glue solution.

Anyone have any experience with priming MDF, particularly cut edges?

Thanks.

Tom R

Thinning the glue is fine, - - it makes it more workable and it penetrates further.

In your case, though, - - I don't see it as necessary. Just prime the edges with oil base.

It's even OK to prime with latex, - - but then you have to lightly sand the swelled fibers.

mpt1123

Thanks, Tom.

Leo G

I would never use MDF as a riser on a staircase. Won't take the abuse.

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I would give this a second thought aswell!!!

neolitic

If you're the last trade out,
it might look good 'til you leave.

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